Just had the local bed manufacturer make me an 80" twin mattress/box spring set. Even in a Silver Streak it's a bit tall. And with a memory foam topper even more so. But this inexpensive new bed with the topper sleeps wonderfully well.
I look forward to a better trailer this calendar year -- different floorplan: a rear bedroom queen -- and will have those folks make up the best bed set possible (as always, after reading all pertinent threads on this forum). Bob Thompson got my attention (former RV retail bed store owner) with his words on tallalay latex on at least one of those threads.