You didn't say if your looking for diesel or gas but based upon your profile pix it looks like gas?
We have a diesel and when pulling the 30' TT, I only use the big rig area (where the 18 wheelers go). It started when we pulled a 35' 5er and I didn't want to have to make those quick snap decisions that people talk about. Also, it's real easy to get in and out of the truck area (though it can be somewhat intimidating having a bunch of huge 18 wheelers staring down at ya!). The DW and son take the credit card in, I clean the windshield, then pump the fuel and we're off. I usually wait for the DW to get back in the truck!
However, if you need gas then you pretty much have no choice but to use the "car" lanes. Some places have "RV only" lanes but we haven't seen many of those in the NY or PA area.
When it's time to eat, we'll either grab something at a McD's (or the like) if it's on the road. If not, we'll make something from the food in the RV. Either way, we'll eat while driving. Not the best for digestion but it's the best we can do on our limited time away from work!