Someone on here has heated floors squares... Maybe Don PIANOTUNA
If you are interested in carpet - pick up the 2' x 2' carpet squares from LOWES... They stick down. You can cut to fit around the walls...
I had free access to a bunch of these when the office I used to work at replaced all of their carpet. I grabbed up all of the dark blue and dark green and put in my off-road POPUP trailer. really nice on the feet in the mornings... The big downside however was no matter how hard your tried - you cannot keep from tracking in outside leaves and things the way we camp off-road all the the time...
Sure helped out big time putting on the floor of the tent bed ends however...
Roy Ken