Sleeping on dinette, cushions slipping

After folding the dinette down my cushions are such a tight fit they can not move around. Are you sure you are putting them down the right way ?

Maybe other campers are different from mine.

Great suggestions! I was also thinking of a memory foam mattress cover.

Carpet underlay works well. I used the 1/2" foam type once for dinette seating and no more slipping. IIRC, foam underlay is somewhat slippy on one side and I seem to remember using spray contact cement to glue it down to the plywood. Would have to store a piece for when the table is used for sleeping on and would be bulky.

A yoga mat might work even better, only about 1/4" thick too. Just used some in our under-bed storage and am surprised how well it works at stopping things from moving around. Rolls up into a fairly tight bundle. Can be found cheap on CL.

Some of mine have Velcro under them, but assuming the table top is part of the platform it may depend on your layout if that would work.

Rubbery rug underlay