I camp and have been camped. The simple solution for a camper is the T34. It can traverse and get a shot away just as you appear on the campers' F.E. Unless they are in a Tiger they don't stand a chance.
I wouldn't mind the random spawn either. Then one can camp from a distance and still be pretty sure of nailing them before they start up anyway.

I don't like the idea of taking the back door away. When enemy is on the field I sometimes reverse out of the VH and surprise them while they are waiting for me to drive out forwards.