[QUOTE=scout4eagles;2578012Your bigger problem may be preventing the metal frame from you original mattress from puncturing the air matress.
We just bought a new king for my FW and it was 4 inches narrower than a standard king. I think the rv manufactures make odd sizes capture a profit center for replacements.[/QUOTE]
I would think that the original thin hide-a-bed mattress would be left in place as padding since it might be needed to maintain the couch configuration when folded.
Ahhhhh yes, the RV 'special' sizes. Our last TT had an RV queen. Regular width, but short which meant part of my 6'4" frame hung off one end. At least our current new Montana has a real queen platform and has an almost new Simmons Beautirest that we were able to pull from our traded 5er, swapping them around.
Dave W along with my DW, Susan and our poodlepups, Callie & Molly,2011 Ford F250 6.7 CCLB, 5er Hitch Option w/B&W Hitch,,Ride Rite air bags, 2014 Montana High Country 343RL (38')