One of the first things we did was to pull out the bed, put in a 7"X7"X60" piece of foam rubber at the head, add plywood "ears" extensions at the wooden frame bottom to help support the added length of the bed (They fit on each side of the bed-lift handle). Now we have a 60'X81" bed that uses regular queen sheets. 2608 came with the Serta matress, and it is very comfortable. My old long body now has plenty of room in the bed now and we can still get around the bottom of the bed OK, and it lifts up OK too.
Jim and Connie w/3 lb. Chihuahua= Nugget
2016 Rockwood Ultra-Lite 2608WS
2004 Dodge Ram 2500