We used a pop-up for a long time and camped all around the state, made it down to WV once too. Then everything went to shit in the pop-up and it started to leak so we sold it. A couple weeks ago we rented an RV and had it delivered to a campsite right on the edge of the Porcupine mountains. That camper was super nice, I really liked it, but renting was pretty expensive relative to just even getting a cabin or something like that for lodging.
I think our next destination will be down in the Smokeys... but don't sleep on the UP, it's really awesome. Just make sure you don't get stuck miles away from gas stations b/c there aren't many. Pictured Rocks rules.