Can anyone tell me the dimensions of the mattress that comes with the Flagstaff Super Lite 526RLWS? I did not know if it is a RV Queen, regular queen or king mattress. We have a brand new Serta Orthopedic mattress and if it fits I'll put it in the 5th wheel. Also is there a regular bed frame in the unit? Sorry for crazy questions but I wanted to reach out to Flagstaff owners before we go to the dealer and place our order. Thanks to everyone.