Thanks for all the advice, I went with the suggestion to extend the bed and go lengthwise.
Since our Burro
is the "ballroom" version (no bathroom), it was easy to extend the bed 16", without blocking anything, giving a RV queen size, about 60" x 72" with a side pocket on the right beyond the closet that the pooches immediately adopted, leaving the rest of the bed to us! I bought a new 4" queen foam mattress and trimmed it to size, and kept our 2" memory foam topper for a permanent set up, which is so comfortable we will never go back.
I can get up in the night now and the wife doesn't even miss a beat in the snoring!
As a result I have a full set of Wide Body Burro
rear cushions that are available free to anyone that needs or wants them, in Albuquerque area.
Thanks again FG community!