2013 Freightliner Cascadia 70in sleeper mattress size?

Most bunks have a mattress 85" by 42 -45". Its an oddball size. Measure the space you have or stop at a dealer get the sizes for that specific make and model

 

my Sapp Bros mattress was 85 x42 fit nice in my KW700
very tight in my Cascadia so I got a 85 x39 fits nice

 

Truck mattresses aren't standardized like home mattresses are and they differ even among different models by the same manufacturer. The most accurate way to find out is to measure the metal pan the mattress in your truck sits in. Then you can either find one that will fit in it or, as I did, order from Mattress Insider (www.mattressinsider.com) a company that makes custom-fit truck foam mattresses. Mine wasn't much more expensive and is the best one I've ever slept on.

 

If you were to give it a "Category" the size would be classified as a "Twin XL"

I have a Tempurpedic, Twin XL. Size is 81" X 39" and fits fine, with a few extra inches for storage at one end or the other.

 

My 13 cascadia came with a standerd twin it fits perfectly width wise and leaves about 2 foot at the end between wall and bed just enough room for my laundry bag and shower bag