FT and Boondocking - what RV length?

I hope you realize that boondocking is different than "staying in a National Forest Campground". Big difference. Staying at any identified campground without hookups is just dry camping. Staying off the highway around here in our National Forests is most likely driving on old logging roads. I have seen many large RV's off these main roads a short bit, but still within getting dusted when others go by. All I can say is "the larger you are, the fewer places you can go and get to".