most people on the forums here probably wouldn't agree with me, but you might want to check out truck campers. As a solo traveler, I find my truck camper very easy to handle. 9 times out of 10, I don't even think about where I'm going to go with the camper. You can get a lot further off the beaten path than any other type of rig. If I do end up somewhere that I can't continue on, it's never been a problem to back up and turn around. Never need to plan ahead to pull into any gas station, never had a problem fitting into any campground site (except for height if there were low branches in a tent site). If I'm traveling between destinations and see something cool, just pull right on over to check it out like in a car.
Truck campers are a lot tighter on space, and you would likely need a truck upgrade to haul it safely. My 4,500-ish pound Arctic fox needs a 3500 dually to handle the weight.
Occasionally I start to get a little cabin fever due to the small interior space, but hey my living room is a huge expansive public lands outdoors instead!
As you're traveling, don't limit yourself only to national parks.....There's tons of awesome national monuments and state parks. As well as tons of BLM land out west with free boondocking camping opportunities. I do spend time camping in national park campgrounds, but the costs can start to add up after awhile. Plus, when I'm camping, I'd much rather enjoy nature with no nearby neighbors (and frequently no visible neighbors), instead of being packed into a public campground with random neighbors all the time.
update: I've visited 30 national parks and 69 national monuments/preserves/military parks, etc. 99/419. Not all with my truck camper, like the last park I visited: Dry Tortugas. An amazing place, that you can only reach by boat or sea plane. I tent camped 2 nights on the beach under the stars there!
