There is a wide range of sizes and weights of fiberglass rigs out there.
As far as beds, it seems most of the smaller rigs have a small double or three quarter sized main bed, 48" x 75". We find, that while the space is enough for two adults to sleep, the lack of "walk around" space means that the one in the rear has to climb over the other one to use the facilities during the night.
We find our 13' perfect for the two of us. We belonged to a Good Sam chapter and on outings, single persons in motorhomes had so much work to just keep them clean. It is like another whole house. And this just refers to the inside!
Consider cleaning and waxing or paying for it to be done...
Good luck in your search.
is located 300 miles from DC and Lil Snoozy
They both offer queen sized beds.
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