Built for Freightliner Sleeper Cabs
Freightliner Semi Truck Mattresses
The Freightliner Cascadia and Classic XL both take a 39x80 mattress — Freightliner sleepers run a size narrower than most other wide-cab trucks. Every SleeperKing model — Classic, Serenity and Premium — is available in this size, ships free, and comes with a 120-night guarantee.
Shop Freightliner Mattresses1,000 comfort coils available · Made in the USA · Free shipping
Semi Truck Mattress Sizes for Freightliner Models
Freightliner sleepers — Cascadia and Classic XL alike — run narrower than most other wide-cab trucks, taking a 39x80 mattress rather than the 42x80 size common elsewhere.
| Model | Sleeper Type | Mattress Size | Max Thickness |
|---|---|---|---|
| Freightliner Cascadia | Raised roof | 39x80 | 8″ – 12″ |
| Freightliner Cascadia | Mid roof | 39x80 | 8″ – 12″ |
| Freightliner Classic XL | Raised roof sleeper | 39x80 | 8″ – 12″ |
Don’t see your Freightliner configuration?
Cab trim packages and non-standard sleeper builds vary by roughly ±1″. SleeperKing manufactures to order, so an off-spec Freightliner bunk can still get an exact-fit mattress — measure the bare bunk pan and request a custom size if your numbers don’t match the table above.
How to Measure Your Freightliner Sleeper
- Remove the old mattress and measure the bare bunk pan, not the mattress currently sitting on it — compressed foam and worn springs will throw off your numbers.
- Measure width and length at the narrowest points. Subtract about one inch from each so the new mattress drops in without bulging at the edges.
- Check headroom if you're running a raised-roof Cascadia or Classic XL with any kind of overhead storage or bunk curtain track.
- Note the trim package. Two Cascadias with the same model year can still differ by close to an inch depending on how the cab was optioned.
Which SleeperKing Model Fits Your Freightliner
Classic
Firm support, budget-friendly, 850 coils. The straightforward replacement for a worn-out factory mattress in a Cascadia or Classic XL sleeper.
Serenity Best Seller
Max comfort with copper-infused lumbar support, 1,000 coils. The most common pick among Freightliner owner-operators running long OTR miles.
Premium
Dual-sided, flippable, 1,000 coils with cool/warm sides. Built for drivers who run hot or want the option to flip the mattress as it wears.
Shop Freightliner Semi Truck Mattresses
Freightliner Mattress Questions
What size mattress fits a Freightliner Cascadia?
A 39x80 semi truck mattress — 39 inches wide by 80 inches long — fits both the raised roof and mid roof Cascadia sleepers.
Is a Freightliner mattress the same size as a Peterbilt or Kenworth?
No. Freightliner sleepers typically take a 39x80 mattress, while Peterbilt and Kenworth sleepers commonly take the wider 42x80 size. Measure before ordering rather than assuming it matches another make.
Does the Classic XL take the same mattress as the Cascadia?
Yes. The Freightliner Classic XL's raised roof sleeper uses the same 39x80 mattress size as the Cascadia.
How thick can a Freightliner sleeper mattress be?
8" to 12", depending on the SleeperKing model and any headroom constraints from overhead storage or a raised-roof bunk curtain.
What if my Freightliner bunk doesn't match 39x80?
Trim packages and non-standard builds can vary by about an inch. Measure the bare bunk pan first — if it's off-spec, SleeperKing builds to your exact dimensions.
Is there a guarantee on Freightliner-fit mattresses?
Yes — the same 120-night guarantee that applies to every SleeperKing mattress, standard size or custom.
