Long Class A rigs with Trailers - Where do they stay?

We pull an enclosed car trailer behind our motorhome. Not as big as the ones you describe, but our total length is about 60 ft. A useful reference I learned about on this forum is a directory called Big Rigs Best Bets (www.big-rigs-rv.com). The authors have personally visited all the campgrounds described and give specific site numbers and the maximum lengths they can handle. Check it out.