Why you can't get into the Fl Keys state parks

I happen to agree with the OP

I was at Pennekamp last week, and my site was across from the bend in the road near the rest room
I had trouble backing my trailer into the site because across the road from me in three adjacent spaces the rigs were so big their vehicles wouldn't fit into their sites, and they were parked half on the road.
I noticed in reading the various responses that just about all of them have big rigs !

Guy