That sort of reminds me of a saying my dad used on me a number of times when I was a kid, “you can’t have your cake and eat it too”.:) RV’s are nothing but compromises, big has a lot of amenities and comfort but the tradeoff is limitations where you can go. Small will go anywhere at the expense of the comfort and amenities. I’m afraid that rig is totally inappropriate for primitive camping. I do a lot of it and I use a 16’ TT if that’s any clue. I could go a little bigger, maybe near 20’ and still pull it off but after that I’d start having limitations that would be unacceptable to me. Even a whole lot of state parks would be a problem with that size.
As said, the rig is designed for on pavement and resorts or commercial parks and taking it off the pavement may be risky unless the road is a good hard packed dry road with a lot of maneuvering room to turn around and no low branches. You could still boondock, but you’d need to stay close to the pavement and pick your spot carefully. Years ago I saw a big TT parked just off the pavement in a meadow because he couldn’t get down the unimproved road to the campground. It looked like a good spot, but it rained during the night and his TT sunk into the ground up to its axles and I’m sure it was no fun getting it out of there.
I believe you need to rethink this and decide if a big luxurious MH with the attendant access limitations appeals to you the most or access to more primitive locations is more important, in which case you need to think radically smaller. Good luck on your decision.