With your setup, definitely don't try the city campground at Lake Leatherwood west of town. We're a 40-foot motorhome and even without the toad, the road in was not fun--avoiding branches on a hilly narrow road with tight curves.
They have five, I think, RV spaces, all on grass and full hookup. However, only a couple of those would hold us, and they had leveling issues.
It's a pleasant place but definitely not big-rig friendly--a campground and not an RV park. We stayed there because there are mountainbiking trails right there.