Trying to decide the right size MH for full timer

We full time in a 34' Tiffin, no sweat. At the risk of sounding trendy we're minimalists--at 68 years of age we're done with "stuff"--we own what we need and no more, we have considerable unused storage space in our coach. If we wanted meaningfully (to us) more room we'd live in a house or apartment. As we get older and perhaps less able bodied more room might become meaningful but not now.