Guess things have changed from two years ago:
http://www.nbcnews.com/id/43511151/ns/travel-active_travel/#.UhUQGRaYnzIPop up slide in truck campers were okay then in that same area after the attacks.
"The forest is allowing hard-sided vehicles made of metal or strong composite plastic to be used at the three campgrounds. Truck-box campers that have a 4-foot high hard side, in addition to a raised upper section, are permissible, but tents and pop-up campers are excluded, as is camping without a shelter."