See if you can get the mattress to bend and keep the storage space as.....well, advertised "pass through storage space". My neighbors bought a similar Murphy bed model Surveyor and were taken back when the mattress dipped into the space. It's a space sving design that defeats the purpose of the pass through storage. Crappy design that really needs to be remedied prior to leaving the factory.
Anyways, my neighbors put a piece of plywood across the top of the storage area and the mattress still folds into the cavity above. Give it a try.
2017 Forest River Surveyor 247BHDS...
...Tugged by a 2016 F250 XLT FX4 SuperCrew, Shortbed 6.2L, 4wd, 3.73...
...Joined with a Husky Centerline TS 800-1200lbs WDH