28-30ft fifth wheel boondock/campable in public lands?

As suggested look at Google Earth but I'll say this. The areas that I boondock here in the east would present a problem with narrow roads, lack of pull outs, or turn around space and small camping areas. It would not be impossible but difficult

2gypsies brings up a good point -- Google Earth can often reveal boondocking sites. Just "fly" low along a forest road and look for pullouts!

West of the Mississippi we've never had a problem with our 40' motorhome. However, we don't just see a road and take off. We research as much as possible, read others' accounts of the area, sometimes follow the road via a satellite image, stop at a ranger station and ask about conditions, and towing a Jeep we would sometimes disconnect before getting on such roads and scout it out first with the Jeep. If the road has a good gravel base we have no qualms about driving it with the RV. Of course, we don't travel over obstacle courses of big rocks. We always found wonderful spots to boondock, quite often surrounded by mountain views, rivers or lakes. We use public areas 90% of our RVing.

Well, public land includes both lumpy land, Forrest Service, and flat land/grassland, BLM. There are some other agencies but the two I mentioned are the largest.

Profdant139 is a lumpy land guy and he's right about access to lumpyland (Forrest Service) for rigs your size. Down here on the flat land (BLM) there's much less of a problem. Deep washes and ruts are our biggest problem. Length, not so much. ;) Topos won't help much for that, recon will.

Have fun wherever you end up!

LS

In the Western US, the real problems aren't the boondocking campsites per se, some of which might be big enough for a 30 foot fifth wheel. The real problems are the narrow and twisty forest roads, the deep ditches, and the lack of places to turn around. It is so hard to maneuver a big rig in those areas that I would not recommend getting very far off the pavement unless you first unhitch and then scout around with your tow vehicle. Really good topo maps and forest service maps are also very helpful.

Notice that I'm not saying that this is an impossible dream. But you will have to proceed carefully. Good luck!