I've been out there for 120,000 miles towing a 35' Jayco TT. Been in some pretty horrible stations that couldn't hardly get out of, at first. Learned over time that where there is a truck stop most likely there are other stations that have cheaper diesel and they are normally RV friendly.
I've had DW get out and see where the pump was and give me a high sign if doable.
Bottom line you can always get in and out of the truck lanes and some have credit card friendly pumps. With DEF the truck lanes are about the only ones that have it even though you don't need it but every tenth or 12th fill up.
Happy trails.
