B+ motorhomes

Gene I was thinking of putting a topper over the both beds since they touch when they are down. The total sleep area is about 72 x 84 with both beds down. I am 6' and when sleeping fore and aft on either the sofa or table I run out of room. When we tried to sleep cross ways the front edge of the sofa does not exactly match the height of the table bed and is right in the middle of your back. A queen topper is 60 x 80 and a king is 76 x 80. I found a nice memory foam one at costco but it's 4" thick and would never fit under the sofa while made up for travel. I have an air bed and I'll try sleeping on it in the 211 here in the back yard before I try a topper. Just wondered if anybody else had dealt with this. On these short trips I'm okay but next year we're thinking OK, FL, and maybe MT to visit family and friends.