Sometimes 35' means 35' to a tree or some other obstruction, in which case you can't squeeze in.
Sometimes 35' means a 35' paved or gravel parking pad, in which case squeezing may work.
I would suggest calling the campground and discussing the 35' limit. You may fit.
Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, previously 4 years as a fulltimer in a '07 DSDP
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