They may already be smaller, wait and see. Worse scenario install hyper mesh around the perimeter or pool noodles, air ir your friend with condensation.
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Jim
Sometime life gets in the way of living.......
NEWYORKHILLBILLY - The dimensions for the 21NE that you received are correct to within +/- 1/2" everywhere. The dimensions for the dinette foot well area are to the inside of the seat cushions. The dimensions at floor level are 34" x 41".
I asked for a smaller mattress in my 2nd E19 after learning on the first E19 the queen bed was wedged in tight which made making the bed and condensation problems.