I'd check the ride heights front and rear first then see if a leveling kit is necessary. I always think of fox as reservoir shocks which are unnecessary on a full size with camper. You're not likely to overheat your stock shocks (you might, but it's rare unless you're a 1%er). You probably dont need 17.5k (based only on your post) so I wouldn't spend the extra money unless there is some other reason. Maybe a 17.5k winch is on sale or fits the bumper better, or...something. I would put as little weight on the front as possible while still getting a winch. Remember, when adding weight front or rear you're effectively creating a lever, more weight farther from the center of gravity, which has a significant impact on ride, especially off road.
T'were me, I'd add add the camper and accessories and then take measurements. I'd only buy new shocks if you need them, understanding that very few shocks allow you to adjust rebound/damping, so almost all shocks are not tuned for the weight of your specific vehicle, and it really doesn't matter. Also, most reservoir shocks are simply made for a different purpose, for going fast over rough/washboard roads. You see them on most vehicles because they are cool, not because they are better. They provide no advantage for on road driving, and little to no advantage for a heavy vehicle being driven slowly off road. Again, t'were me, I'd buy some good Bilstein or Rancho 9000 shocks.
Edited by Adventurer, 20 December 2019 - 05:18 PM.