You can get several apps for your mobile phone that give information regarding fuel stops for RVs.
Pilot/Flying J still gives discounts, their dump sites are no longer free but they also offer overnight parking, free of charge.
I also keep a copy of "The Next Exit" in the door pocket of my truck, the RV friendly fuel stops are clearly marked, as are those sites that sell diesel.
Watch the signs for Gas at the interstate exits.
If they say 'Diesel' at the bottom, they usually have room to pull through an RV even at the gas pumps.
