Everyone (dispatchers, lease agreements, half the agents in this industry) uses bobtail, non-trucking liability, and unladen as if they're the same coverage. They're not. They answer two different questions: is there a trailer attached? and are you under dispatch? Which policy responds to your accident depends on which combination you were in when it happened, and adjusters absolutely pull dispatch records to find out.
Here's the clean version of each, then the table.
Bobtail liability: no trailer, dispatch doesn't matter
Bobtail liability covers you while driving the tractor without a trailer attached, period. Dispatch status is irrelevant to the trigger. Dropped the trailer and heading to the yard? Bobtail. Driving the tractor to a repair shop between loads? Bobtail. Here's the flip side that surprises people: bobtailing to your next pickup under dispatch is covered by a true bobtail policy, but pulling an empty trailer home after delivery is not, because a trailer is attached. The trailer is the trigger, not the load, not the dispatch.
Non-trucking liability: not under dispatch, trailer doesn't matter
Non-trucking liability (NTL) covers you when you're driving not under dispatch and not in the business of trucking, heading home after dropping the load, running to the store on Saturday, driving to get the truck serviced on your own time. The trigger is business use, not the trailer. And that's where the trap lives: NTL policies exclude anything that smells like furthering the motor carrier's business. Deadheading to your next dispatched pickup, driving to a mandated inspection, even fueling up for tomorrow's dispatched load. Adjusters have denied all of these as "in the business of trucking." NTL is genuinely cheap, commonly $30–$50 a month, precisely because its trigger is that narrow.
Unladen liability: no load, with or without a trailer
Unladen liability covers the power unit whether it's bobtailing or pulling an empty trailer, as long as there's no load. It's the broadest of the three on the trailer question, and it's the one specific contracts actually name: UIIA agreements for intermodal work require unladen liability (typically at $1M), because drayage operators constantly move empty containers and chassis. If you do port or rail work, "I have bobtail" does not satisfy your UIIA requirement. Read your interchange agreement. It says unladen, and it means it.
The three-way comparison
| Bobtail | Non-trucking (NTL) | Unladen | |
|---|---|---|---|
| Trigger | No trailer attached | Not under dispatch / not business use | No load (empty trailer OK) |
| Under dispatch, no trailer | Covered | Not covered | Covered |
| Under dispatch, empty trailer | Not covered | Not covered | Covered |
| Off dispatch, personal errand | Covered (if no trailer) | Covered | Covered (if no load) |
| Loaded, any status | Not covered | Not covered | Not covered |
| Who requires it | Some leases (loosely worded) | Most lease agreements | UIIA / intermodal contracts |
| Typical cost | ~$30–$60/mo | ~$30–$50/mo | Varies; priced for drayage |
Who actually needs which?
If you're an owner-operator leased to a motor carrier, the carrier's primary liability covers you under dispatch, hauling their loads, and stops mattering the moment you're not. Your lease almost certainly requires NTL (many say "bobtail" but mean NTL; the industry's been sloppy about this for decades). The real question is what your off-dispatch driving looks like: if you regularly deadhead an empty trailer home after delivery and you're arguably off dispatch, the gap between a bobtail form and an NTL form is exactly where your accident lands. Get the policy whose trigger matches your actual habits, not whichever word the lease used.
If you run under your own authority, you generally need none of these. Your primary liability is yours 24/7, on dispatch and off. Confirm how your policy treats personal use rather than assuming, but don't let anyone sell you NTL on top of your own primary; it's paying twice for the narrower half of coverage you already have.
If you do intermodal/drayage, unladen at the UIIA-required limit. Full stop.
The real-world gap nobody warns you about
The carrier's policy and your NTL policy can both deny the same claim. The motor carrier's insurer says you weren't under dispatch; your NTL insurer says you were furthering the business. You're in the middle with a lawsuit and two denial letters, and the fight turns on dispatch records, ELD data, and what your lease says about when dispatch ends. This is why we tell leased operators: the cheapest fix is knowing before the claim which policy owes which drive. Bring us your lease and your dec pages and we'll map it. It's the same exercise we walk through in physical damage & non-trucking liability, which covers the other half of the leased owner-operator package.
How McClure helps
We read lease agreements and match the coverage to the wording, bobtail where it says bobtail, NTL where it means NTL, unladen where UIIA demands it, so there's no daylight between what your contract requires and what your policy triggers on. If you're leased on or about to be, send us your details and we'll quote the right form, usually for less than you're guessing. Already covered and just need proof for the carrier? Request a COI and we'll turn it around.