I have never had a truck camper...so can't speak to the suspension issue
Re. 'to a/c or not a/c'....a few thoughts....
You sure you'll never end up traveling in the summer anywhere it gets above 90 degrees or so?
Also, seems to me it depends on how you'll use it...i'm assuming that, because of their small size, most truck-camper folks use their rigs mainly to be where they want to be rather than as a destination in & of themselves....that the truck camper is simply a place to sleep, shower and eat while in a state park or wherever, with most of the time spent outside or on 'excursions' rather than sitting inside just to sit inside...
seems to me no up-front need for a/c if you know you'll camp mostly or exclusively where it's cool even in the summer, you don't plan to spend a great deal of time in the camper except for sleeping, and you're not worried about marketability if/when it comes time to move the rig on to a new owner...i DID like the 'even if not, get it prewired for a/c' idea