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Your auto policy already covers part of this
When a trailer is hitched to your vehicle, your auto policy’s liability coverage extends to it. If the trailer swings into another car while you are towing, the towing vehicle’s liability pays. This surprises many owners who assume the trailer needs its own liability policy. It generally does not, while attached and moving.
The gap is everything else. Your auto policy does not cover physical damage to the trailer itself, damage to its contents, or anything that happens while the trailer sits parked and unhitched. A stolen trailer, a hail-dented enclosed hauler, or a tree falling on it in the driveway are all outside the auto policy. That is where trailer insurance comes in.
What trailer insurance costs by trailer type
Cost tracks the trailer’s value and how it is insured. Based on 2026 industry consumer guides:
A basic utility trailer added as an endorsement to an auto or homeowners policy typically runs $100 to $250 a year. This is the cheapest path and fits open utility trailers worth a few thousand dollars.
A boat trailer is usually cheapest bundled with the boat policy, adding roughly $25 to $200 a year.
An enclosed or cargo trailer, which carries more value and more theft risk, usually needs its own standalone policy at $300 to $500 or more a year. Enclosed motorcycle trailers fall squarely in this category.
A travel trailer or camper generally needs a standalone RV policy, commonly $300 to $600 a year for standard coverage, rising past $800 to $1,500 for a high-value trailer with full coverage.
What a trailer policy covers
A standalone trailer policy mirrors auto coverage in structure. Comprehensive covers theft, fire, vandalism, hail, and storm damage. Collision covers crash damage while towing. Some policies add contents coverage for what is inside the trailer, which matters for an enclosed trailer hauling motorcycles, ATVs, or tools worth more than the trailer itself.
Progressive offers a useful data point for motorcycle owners specifically: its transport trailer coverage provides up to $10,000 of physical damage coverage for a trailer, available as an add-on to a motorcycle policy. For a rider hauling one or two bikes in an enclosed trailer, that add-on can be simpler than a separate trailer policy.
Toy hauler owners should read the fine print. A basic toy hauler policy may not cover the cargo in the garage bay. Insurers note that a separate contents endorsement is typically needed to protect ATVs, motorcycles, and dirt bikes stored inside the hauler.
When you need a separate policy versus an endorsement
Endorsement on an existing auto or homeowners policy works for inexpensive open trailers. The premium is small and the paperwork is one line. It stops being enough when the trailer’s value rises, when it carries valuable cargo, or when it spends significant time parked away from home.
A standalone policy makes sense for enclosed trailers, trailers worth more than about $5,000, and any trailer used commercially or stored off-site. Lenders require comprehensive and collision on financed trailers, which usually forces the standalone policy.
Buying it right
Start with the carrier that holds your auto policy and ask about a trailer endorsement. Compare that against a standalone quote, and check whether your motorcycle insurer offers trailer add-ons like Progressive’s. Confirm the contents question explicitly: ask whether the bikes or gear inside the trailer are covered, and at what limit. RV insurance costs overlap with trailer pricing for the larger towables, boat insurance is the natural bundle point for boat trailers, and personal watercraft insurance covers the machines many of those trailers haul.
