Every unit is a compromise. From what you described in your OP you will be doing more traveling than camping in one spot, so a smaller unit is better. Things to consider is how much stuff you want to bring with you, bikes, fishing gear, rafts or kayaks etc. Most NP's are dry camping along with NFS, SP's, COE, and BLM CG's. Smaller Class A'B's and C's have minimal storage and FW capacity (30-40 gals). I traveled in an 33 ft A and a small tow car for those reasons. Having said that knowing what I know now I would seriously look at a small TT with one slide out 18-24ft. Have have 50-60 gals of FW, and 2000 lbs or more CCC and can be pulled with a 1/2 ton truck. The ORV creek side has 78 gals of FW which is more than my A which has 60 gals. Once you set up camp you have the truck to explore with with out having to break camp. The full truck bed can be used to store your stuff. You lose this storage with a 5th wheel and a truck camper.The truck can also be used as a second vehicle when your not camping which will be most of the time if you are still working. Good luck in your search.