Re: I-81 I-95 rest areas
Well, I've never stayed at one, but I buy gas there whenever practical. They have a 'RV' specific fueling island, with water, air (usually doesn't work, of course), long handled windshield cleaners and dump station. But the best part is the diesel pumps have the small nozzels, not the big ones for trucks which don't work well in my coach.
The stores are nice too, with a good selection of stuff, prices not too bad and occasionally good, and a decent resturant with buffet.
They have a discount club for a few cents a gallon off of fuel/propane, and claim to have the best fuel price in any area they are in. I have only found one case so far where this was not true (sort of). This was in a different town, so a good lawyer could make the claim it was not 'in the same area'.