Full Size Mattress in a 21C

hokie0504

New Member
Joined
Jul 20, 2025
Posts
7
Location
Hardeeville SC
If anyone has swapped in a Full Size (54"x 75") for the standard 21C mattress, does it look small and do you have a picture? If it's too small, I'm thinking of adding a 5" landing at the top so that the bottom fits the edge. I realize that I will need to trim off the one corner still.
 
Hi...We have a 21C on order. We have decided not to get the mattress that comes with the trailer. We are instead ordering a mattress from Wilderness RV mattress. They can custom make a mattress that will fit the dimensions for the 21C. Escape sent me the diagram of the exact measurements. It was easy for me to use the online tool to make a custom order.
 
Check the actual width of your 21C platform. While my 2017 21 measures 54" wall to wall, the stock mattress is only 52" wide. That leaves a bit of breathing room on the outside wall to allow air circulation. You might find an actual 54" wide full size mattress a bit tight with sheets, a blanket & quilt tucked in.
 
We use a Full XL mattress pad and fitted sheet, they fit perfectly (except for said rounded corner, and sliced off corner, we tuck those in), and a queen sized comforter in a duvet cover instead of top sheets, this makes it much easier to get in and out of bed
 

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