Hi Mike,
We have a 21 foot Cobra "Chev" 350 motorhome. It is super awsome for weekends
and up to 2 weeks for 2 people. No need for a towable, and small enough to back
boats up at the lake. We can park it any where, and no problem if you happen
down a dead end road. We have been down many roads where a 30 footer would
have been a real pain. I like to go where I want without wondering if there
is an out for the vehicle. That said, the gas mileage is 10.5 a gallon, so
you won't save a whole lot with a shorter rig.
Enjoy what ever you get, Brian