Hi Mussfly, welcome to the forum.
Unfortunately I do not have a solution for your problem but, having experienced the same issues, I do sympathize.(F250, Cougar 327 RES)
My experience has been hit and missed. For the most part truck stop chains like Flying J have been more sensitive to big rigs. Many even welcome overnight stays(no hook ups), dump stations, showers, meals etc.
I find the Good Sam Trip Planning application to be helpful in scouting out your fuel stops before leaving for your destination. Picking up a Blue Beacon site pamphlet also helps combine a fuel stop with a rig wash as you approach your destination.
Happy trails... enjoy !!
GPG
GPG 🙂
2014 Ford F250, 6.2L, 4.30 Ratio, 6 speed
2014 Cougar (by Keystone) 327 RES