I had a Viking pop up camper that I bought new WAY back in the day...around '75. I took it everywhere, and probably used it 200 times before I finally got rid of it. In all of that time, the *only* problem I had was running out of LP gas one particularly cold winter night. In short, I had *no* problems whatsoever with mine. The crank system that Viking used was a little different than some manufacturers, but whatever it was, it worked like a charm.
The beauty of a pop up is the price, AND you don't need a main battle tank to haul it around...I had a '76 Monte Carlo and a '78 Dodge Magnum (the original..it did NOT have a hemi lol). A class one hitch, (depending on the weight of the trailer), and you're ready to go. No fuss, no muss.
Buy a name brand camper like Coleman, from a reputable dealer, and you will more than likely have 0 problems with it. There is some periodic maintainance, and you don't want to leave it completely exposed to the elements for years w/o using it...if you have a car port or something like that, it's better over the long term.
I had a blast with mine...from the mountains to the beaches, all over the place...much fun was had by all. I looked at some Colemans a couple of years ago, and they were pretty cool.
If you can afford it, GET AIR CONDITIONING!!!