I've read a lot on blogs of full timers and what they do is visit other full timing blogs especially those that like to boondock. Then utilize Google Earth to visually check the area and if you have a tow car, park your RV, take your toad in and check out the sites. Another option is to call the nearest BLM office and talk to them, ask them access road condition for your rig. With RV.net, you can post questions up here for specific areas, also use the internet and Google "dispersed camping in Gila National Forest" (without the quotes) just as an example and you will be surprised at what comes up.