Our trailer is 40', the Volvo was 27', we needed 70' sites. We traveled 33 states excluding the northeast and found parks where we went. Just skip the words "Big Rig" and that only means a 45' motorhome. We checked Trailer Life Campground guide and often called the potential campground to verify the size of the sites.
As C.B. says, we have the sized rig for our comfort. We worry about satellite access more than trees. National and State parks were not our targets.
Dale & Mark Bruss
11 Years Full-Timing now 40' Travel Supreme
Now with a 2016 Bounder 33C
Lots of RV Information at www.dmbruss.com