Coverage line
Bobtail liability is the coverage that responds when the tractor is off-dispatch — running home, on a personal errand, or repositioning outside motor carrier business. The exact gap your primary auto policy excludes.
Non-trucking liability — usually called bobtail liability in everyday conversation — is the coverage that responds when the tractor is operated off-dispatch. Bobtailing home after a delivery, running personal errands in the truck between loads, repositioning the tractor outside motor carrier business — these are the use cases the primary trucking auto liability policy specifically excludes, and the use cases bobtail liability was built to cover.
The form exists because of the architecture of the motor carrier policy. Primary trucking auto liability is filed with FMCSA under the motor carrier authority — it responds when the tractor is on motor carrier business. The moment the tractor goes off-dispatch, the primary form is excluded by its own dispatch carve-out, and any liability for an accident during that window falls on the operator personally unless a bobtail policy is in force.
For owner-operators leased to a motor carrier, bobtail is not optional in practice. The lease agreement almost always requires it, the motor carrier verifies it before authorizing the lease, and operating without it leaves a gap the operator cannot afford on a bad day. The mechanics — bobtail versus non-trucking liability, the trailer-attached question, typical limit structure — are the practical questions that decide whether the coverage matches the actual off-dispatch use pattern.
Bobtail liability responds to bodily injury and property damage caused to third parties by the tractor while it is operated off-dispatch — without a trailer attached on a strict bobtail form, or regardless of trailer status on a broader non-trucking liability form. The form trigger is the off-dispatch use of the tractor, not the trailer status alone; off-dispatch is the coverage activator.
What bobtail liability does not cover:
The off-dispatch trigger is the load-bearing concept on this form. Anything that happens while the tractor is under dispatch is the primary form’s responsibility; anything off-dispatch is bobtail’s responsibility. Reading the dispatch definitions in both policies — they should be consistent — is how the operator avoids the no-coverage gap between them.
Bobtail liability is the coverage that exists because of how motor carrier authority is structured. The FMCSA requires the motor carrier holding interstate authority to file proof of public liability coverage that responds to operations conducted under that authority. The primary auto liability form is built around that filing — it responds to motor-carrier-business use of the tractor. Off-dispatch use is outside the federal filing structure and outside the primary form.
For owner-operators leased to a motor carrier, this creates a precise coverage architecture. The motor carrier’s primary auto liability covers the tractor while it is under dispatch for that motor carrier. The owner-operator’s own bobtail policy covers the tractor while it is off-dispatch — driving home from a terminal, running errands between loads, or repositioning for personal reasons. The lease agreement defines when dispatch begins and ends; bobtail and primary should mesh at that boundary without overlap and without gap.
The Owner-Operator Independent Drivers Association (OOIDA) publishes industry context on owner-operator coverage structure and lease-related insurance requirements. The American Trucking Associations covers the broader motor carrier framework. Both organizations recognize bobtail as one of the foundational coverages for leased owner-operators — the non-trucking liability gap when the tractor is off-dispatch is the exact reason the form exists, and operating without it is a personally-exposed position.
Two terms get used interchangeably in this space but mean meaningfully different things on policy forms: bobtail liability (narrow trigger — tractor without trailer, off-dispatch) and non-trucking liability (broader trigger — tractor off-dispatch regardless of trailer status). Owner-operators who occasionally tow personal trailers should pay attention to which form they actually have on the policy.
Bobtail liability claims are less voluminous than primary auto liability claims for most operators, because off-dispatch hours are a smaller fraction of total operating time — but the claims that do happen tend to fall into a consistent set of categories:
Specific carriers are not named here per our coverage placement policy — appetite changes faster than a website can. The Truck Guard Insurance homepage lists the active panel quoting motor carrier risks today.
Bobtail liability limits are structured similarly to primary auto liability — a per-occurrence combined single limit in most cases — but typically set at a lower number than the primary limit. The off-dispatch exposure is narrower than under-dispatch exposure for most operators, and the bobtail premium scales accordingly.
Motor carrier lease agreements often specify a minimum bobtail limit the owner-operator must carry while leased. The operator should match or exceed that minimum at bind, both to satisfy the lease and to protect personal assets against the catastrophic off-dispatch loss the form is designed for.
The strict bobtail versus broader non-trucking liability form choice is functionally part of the limit and structure conversation — a strict bobtail form at the same limit number is a narrower coverage than a non-trucking liability form at that same number. We walk through form selection at quote time with the lease agreement and the off-dispatch use pattern on the table, because the form that pays a claim is the form that anticipated the off-dispatch use the operator actually engages in.
We are a specialty trucking insurance agency. Bobtail and non-trucking liability are the coverages where leased owner-operators most often have the wrong form on the policy — strict bobtail when they needed non-trucking liability, the wrong limit relative to the lease requirement, or a dispatch definition that does not mesh with the primary form on the motor carrier policy.
We work with specialty trucking carriers in our panel rather than the generic commercial auto market, because the off-dispatch coverage trigger and the lease-agreement matching are different. We walk through bobtail versus non-trucking liability form selection at quote time, verify the limit against the lease agreement where the operator has it available, and check that the dispatch definitions on the bobtail and primary forms mesh cleanly so the operator is not exposed in the boundary.
When you have a new lease agreement that requires bobtail to be in force before the first dispatch, an off-dispatch claim where the primary form has denied coverage, or a question about whether the form you have on the policy actually covers your off-dispatch use pattern — that is what we do.
Other coverages we write for motor carriers:
Motor carrier classes we write:
Primary regulatory and industry sources:
Bobtail liability is auto liability coverage for the tractor when it is operated off-dispatch — without a trailer attached, and not on motor carrier business. The classic scenario is bobtailing home after a delivery, running personal errands in the tractor between loads, or repositioning the truck outside the scope of motor carrier dispatch. The form responds to bodily injury and property damage caused to third parties during off-dispatch use. It is a public-liability coverage paid to the injured party, structured similarly to primary trucking auto liability but with a coverage trigger that is the inverse of the primary form.
Primary trucking auto liability is written to respond when the tractor is operating under dispatch on motor carrier business — pulling a trailer, moving between loads, or otherwise on the road for the motor carrier. Off-dispatch use is specifically excluded from the primary form. The exclusion exists because the motor carrier whose authority the primary policy is filed under (and whose name is on the BMC-91 filing) is not the party operating the truck for personal purposes — the owner-operator individually is. The bobtail form fills the gap with a separate policy that responds to the off-dispatch use the primary form was never designed to cover.
Almost always, yes. An owner-operator leased to a motor carrier typically operates under the motor carrier authority and under the motor carrier primary auto liability filing — which means the primary policy covers the tractor while it is under dispatch for that motor carrier. The moment the lease ends for the day, the tractor goes home, or the owner-operator runs an errand in the truck, the primary policy is excluded by its off-dispatch carve-out. Without bobtail, the owner-operator is uninsured during off-dispatch use — and a serious bodily-injury claim during that window falls personally on the operator. The lease agreement with the motor carrier almost always requires bobtail to be in force.
The two terms are used interchangeably in much of the market, but a meaningful distinction exists in the policy forms. Bobtail liability narrowly responds when the tractor is operated without a trailer attached, off-dispatch. Non-trucking liability is a broader form that responds when the tractor is operated off-dispatch whether or not a trailer is attached — including personal use scenarios where the owner-operator hooks a personal trailer or moves another vehicle in tow. The forms are similar but not identical, and the right choice depends on what off-dispatch use actually looks like in the operation. Read the form definitions before assuming the two terms mean the same thing on your policy.
A strict bobtail form does not — the form trigger is the tractor operated without a trailer, off-dispatch. The moment a trailer is attached (even a personal trailer with personal cargo, even unloaded), the strict bobtail form may not respond. Non-trucking liability forms are broader and typically respond regardless of trailer status, as long as the use is off-dispatch and not motor-carrier business. Owner-operators who occasionally tow personal trailers (an RV, a boat trailer, a personal flatbed) should ask specifically whether the form on the policy is strict bobtail or broader non-trucking liability — the difference matters on the day of a loss.
Bobtail limits are usually structured as a per-occurrence auto liability limit similar in shape to primary auto liability but typically at a lower number, because the off-dispatch exposure is narrower than under-dispatch exposure for most operators. Motor carrier lease agreements often specify a minimum bobtail limit the owner-operator must carry while leased; the operator should match or exceed that minimum. The right limit depends on the lease requirement, the owner-operator personal asset exposure, and the off-dispatch use pattern. We work through limit selection at quote time with the lease agreement on the table where the operator has it available.
Send the basics on your tractor, the motor carrier lease in force, the bobtail limit the lease requires, and the off-dispatch use pattern. We pull the panel of specialty trucking markets quoting your class today and walk you through bobtail versus non-trucking liability form selection and limit structure before you bind.
