I would NOT let a MH sit for extended periods of time (6 months) - especially through a Pittsburgh winter. You will find that the mechanicals will deteriorate FAST. Brakes will rust and seize, exhaust will rust. lots of condensation on the inside of the engine, seals will dry up etc etc.
I have a classic car that I did not drive for 6 months - it took me several weeks to get it road worthy (brakes/seals/carbs.....); I now drive it once a month an hour or two.
I once neglected to properly winterize my boat - again problems in the spring - mainly with rust/condensation.
My vote foes to a TT - you get more floor-space for the $$$. You don't need to purchase a Pick-up - think of a full size van.
gerry