You’re staring at a trunk full of boxes and a car that’s about to go on a truck. It would be so much easier to just toss the boxes in the back seat and let the car carrier take them along with the vehicle. Before you do, here’s the problem: almost every car shipping company will tell you “a little is fine,” but almost none of them explain what that actually means, what it costs you if something goes wrong, or why the rule exists in the first place.
This guide gives you the real answer — grounded in how carriers are actually licensed and insured, not just a one-line “no” that ignores how auto transport works in practice. We’ll walk through what’s typically allowed, the insurance gap nobody mentions until it’s too late, and when it’s smarter to just ship your stuff separately.
The Short Answer
Most carriers will tolerate a modest amount of personal cargo — commonly cited across the industry as around 100 pounds — packed in the trunk or cargo area, below the window line, so nothing is visible or able to shift during transit. That’s a common carrier policy, not a universal legal guarantee, and it is not the same as your items being covered, protected, or guaranteed to arrive. Some carriers enforce it strictly; others barely check. The amount you can get away with and the amount you’re actually allowed are two different things, and the gap between them is where first-time shippers get burned.
Why This Isn’t a Simple Yes or No
Car shipping carriers are licensed by the Federal Motor Carrier Safety Administration (FMCSA) to haul vehicles — that’s their operating authority. Hauling household goods and personal belongings as cargo is a separate category of authority, with its own licensing, insurance, and compliance requirements. A truck that’s authorized and insured to transport vehicles isn’t automatically covered to transport your boxed-up belongings as freight. That’s the structural reason brokers hedge with vague answers instead of a clean “yes” — legally, loading a car down with household items blurs the line between two different kinds of hauling authority, even though in practice it happens on nearly every load, every day.
The Weight Problem: Why It’s Not Just About Space
A car carrier is a commercial truck, and commercial trucks are subject to federal and state weight limits on gross vehicle weight and per-axle weight. A fully loaded hauler carrying 6-10 vehicles is already calculated close to those limits. Add 100+ extra pounds to several cars on the same load, and the truck can tip into overweight territory — which is a real liability for the carrier at a weigh station, not a hypothetical one. This is the practical reason the common limit sits around 100 pounds per vehicle: it’s a number carriers can absorb across a full load without real risk, not an arbitrary courtesy.
It also explains why carriers ask for items to be kept low, in the trunk, below the window line. Loose or visible cargo shifts the vehicle’s weight distribution, can obstruct inspection of the vehicle’s condition at pickup, and in an open-transport load, is exposed to weather and road debris the entire trip.
The Insurance Gap Nobody Explains Upfront
This is the part that matters most if you’re deciding whether to risk it. The cargo insurance every FMCSA-licensed carrier is required to carry covers damage to the vehicle — not the contents inside it. If a box in your trunk is damaged, goes missing, or is stolen during transit, the carrier’s transport insurance will not pay a claim for it, and the carrier is generally not liable for it either. Any recovery would have to come from your own auto, homeowner’s, or renter’s insurance policy — and depending on your policy, personal belongings left in a vehicle in transit may not be covered there either.
In other words: you’re not just risking a $0 insurance payout from the carrier — you may be risking $0 from anyone. That’s the real tradeoff behind “just throw it in the trunk,” and it’s worth weighing against whatever few dollars it saves you.
What Carriers Actually Tend to Tolerate
In practice, most drivers won’t dig through a sealed box in your trunk, and a few bags or a single small box below the window line is unlikely to raise an issue at pickup. But tolerance varies enormously by carrier, by driver, and even by load — a truck that’s already near its weight limit that day may refuse cargo it would have accepted on a lighter run. Some brokers and carriers have a strict zero-tolerance policy and will refuse pickup if they see boxes piled in the back seat. Treat any “it’s usually fine” answer as exactly that — usual, not guaranteed — and always confirm your specific carrier’s policy before pickup day, not after the truck is loaded.
The Smarter Alternative: Ship Your Belongings Separately
If what you’re trying to move is more than a small personal bag, it’s almost always cleaner — and often not much more expensive — to ship boxes separately rather than gamble on uninsured cargo riding in your trunk. A large box shipped through standard carriers typically runs in the range of roughly $25 to $40 for ground service on a single package, scaling up from there by weight and distance, while full moving-box shipments through freight or moving-box services can range from several hundred to a few thousand dollars depending on volume. Compare that against the value of what’s actually in your trunk — if it’s anything irreplaceable, breakable, or worth more than the shipping cost, separate shipping with real tracking and real insurance is the safer math.
If You Do Pack the Trunk: A Few Practical Rules
- Keep everything below the window line and out of sight — nothing stacked on seats or visible through glass.
- Pack light — treat 100 lbs as a ceiling, not a target, and confirm your specific carrier’s limit before pickup.
- Skip anything irreplaceable, fragile, or valuable — if it would hurt to lose it with zero recourse, it doesn’t belong in the trunk.
- Seal boxes and secure loose items so nothing shifts or rattles around during transit.
- Get your carrier’s cargo policy in writing (even a text or email) before pickup day, so there’s no surprise at loading.
Whatever you decide, the choice should be informed — not a guess based on what a friend did last time they shipped a car. If you’re weighing the cost of separate shipping against the risk of trunk cargo, it helps to first understand how car shipping costs actually break down by route, since that’s the number you’re comparing against. And if you’re nervous about what condition your vehicle — and anything left inside it — might arrive in, our breakdown of what’s normal wear versus real damage after transport is a useful companion read. For a full walkthrough of the process from booking to delivery, see what happens after you book your car shipment.
The Bottom Line
A small bag below the window line is low-risk for most shipments. A trunk packed with moving boxes is a different bet entirely — one where the insurance math doesn’t favor you. Ask your carrier’s actual policy before pickup, keep anything you can’t afford to lose out of the car, and when in doubt, ship it separately. Best Care Auto Transport is happy to tell you straight, before you book, exactly what a specific carrier on your route will and won’t allow — no vague “usually fine” required.
Frequently Asked Questions
Can I put anything in my car when I ship it?
Most carriers tolerate a small amount of personal cargo — commonly around 100 pounds — packed in the trunk below the window line, but this is a carrier-by-carrier policy, not a guaranteed right, and some carriers refuse any personal items at all.
How much weight can I pack in my car during auto transport?
The industry-common ceiling cited by most carriers is roughly 100 pounds, kept low in the trunk or cargo area. Exceeding that can risk the carrier being overweight at a weigh station, and some drivers will refuse the load entirely.
Will my belongings be insured if they’re stolen or damaged in transit?
Generally, no. The cargo insurance carriers are required to hold under FMCSA rules covers the vehicle itself, not personal items inside it. Claims for stolen or damaged belongings typically have to go through your own insurance, if they’re covered at all.
Where should I pack items if my carrier allows them?
Keep everything in the trunk or cargo area, below the window line, sealed and secured so nothing shifts or is visible from outside the vehicle during loading and transit.
Is it cheaper to ship my boxes separately instead of packing them in the car?
Often, yes, once you factor in risk. A single large box can ship for roughly $25-$40 via standard ground shipping, and larger shipments scale from there — frequently a better trade than uninsured cargo riding in your trunk.
