Bunk LedgerWinter cab gear that earns its space (2026)
Winter in a sleeper is a moisture problem and a glass problem as much as it is a cold-bunk problem. The gear that earns its space is small, fused where it plugs in, and easy to stow in April. The gear that does not belong is anything that burns fuel inside the cab.
What to carry, by the job it does
On a phone, this table moves sideways. The first column stays put.
| Job | What to look for | Cab note | Not for |
|---|---|---|---|
| Keep bedding dry | A calcium chloride tub, the hardware-store moisture absorber | Set it on the floor, cap it before you roll, keep it off the bunk and away from food | A cab where it can tip into the aisle in a hard brake |
| Dark and a little warmer at the glass | A cover cut for a semi windshield, or the panel method in the curtain note | Measure the glass. A car cover is the wrong shape | Driving. Take it down before you move |
| Heat in the bunk without idling | A 12 V heated throw with a fuse in the plug and a shutoff | 12 V on the label, not a 120 V home blanket. Do not fold it double while it is on, and do not bury it under a comforter | Overnight use on a socket you have not identified, shared with the fridge |
| Hands and glass in the yard | A long-handle scraper and a spare pair of gloves | The windshield is taller than a car's. A short scraper makes you climb | Leaving it loose where it can fly forward |
| A dry layer | Wool or synthetic socks, a knit cap, a spare shirt | Cotton next to skin stays wet if you sweat the load | A cotton "winter pack" that never dries |
Heaters we will not recommend
Do not run a camping propane heater, a butane stove, or any unvented combustion heater in the sleeper. Those devices can fill a closed cab with carbon monoxide. A cracked window is not a plan.
A 1,500 W electric space heater is the other poor answer. It needs an inverter at least that large, it is a heavy amp load on the batteries, and it is a poor overnight companion on a starting battery. If the truck has an APU or a factory bunk heater, learn that system instead of adding a household heater. We are not going to tell you which idle rule applies at a given dock. If you cannot idle, that is a company and a local question, and a 12 V throw is a blanket, not a legal strategy.
The 12 V throw, specifically
Look for three lines on the listing: voltage (12 V DC), a fuse in the plug, and some kind of shutoff or timer. A home electric blanket with a household plug is the wrong object even if you own an inverter.
Use it as a layer, not as a nest. Heaters that can bunch up are how soft goods scorch. Follow the tag that comes with it. If the truck's socket dies with the key, the blanket dies with the key, which is inconvenient and also a sort of safety. Know which you have before you count on it for a cold night.
It shares a fuse with anything else in that socket. A fridge and a heated throw and a phone charger on one splitter is how the fuse goes on the coldest night of the trip. One load at a time, or know the fuse.
The other two winter objects that earn the space: a Amazonwindshield cover that comes off before you drive, and a Amazoncalcium chloride moisture tub that stays capped and off the bunk.
Glass, wipers, and fluid
A cover only works if it fits the glass you measured. Buy the size whose listing prints dimensions, and compare them with the tape. "Fits most semis" is not a dimension.
Washer fluid has a temperature on the jug. The summer jug you left in the side box will freeze in the lines. Swap it before the first hard cold, and carry a scraper you can use while standing on the ground.
Along the way
Conclusion
Layer the bunk and manage moisture before you add a heater. The heaters that do not belong in a closed sleeper are not a gray area.
FAQ
Is a small propane heater fine if the window is cracked?
No. Unvented fuel-burning heaters do not belong in the sleeper. Carbon monoxide is the reason.
Can a household space heater run all night?
Not from a starting battery, and not as a 1,500 watt overnight load. Read the inverter guide before you plug one in.
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