Using Good Sam Card a hassle at Flying J

I love that Good Sam and Flying J/Pilot have a cooperative agreement going. I like the discount. What I don't like is the fact that we can't use the Good Sam Card to get the discount at the pumps in the RV Lanes, but that we have to go inside, waiting in line for the ONE person who is manning the register for all of the pumps as well as taking orders for food, etc., then estimate how much we will pump (hard to do after you have been climbing mountains in the heat with the generator going so the A/C keeps you cool), then going back inside after you have pumped to get a reconciled receipt. This happened to us twice this weekend in California.