We always enjoyed disbursed camping most of all and found our sites in the mountains and forest. National forests are great places for disbursed camping opportunities but check with district office for regulations that pertain to that district. When we moved from our 25 foot trailer to a 34 footer we had to give up two sites we enjoyed a lot, both in the Uinta Mountains of Utah and the Sawtooth range in Idaho. Both sites required utilizing a road that my 55 foot long rig would not make the necessary turns. I've done this with a 4x2 truck for over 40 years and have never been SERIOUSLY stuck but you just have to be smarter than the mud holes you might encounter.
ONE OF OUR FAVORITES: Gravel bar at the confluence of Matengooska and King River, Alaska
Clear water from the King joins Glaciated water from Matengooska
2011 F-150 HD Ecoboost 3.5 V6. 2550 payload, 17,100 GCVWR -
2004 F-150 HD (Traded after 80,000 towing miles)
2007 Rockwood 8314SS 34' travel trailer
US Govt survey shows three out of four people make up 75% of the total population