Here is my point of view. We have been pulling with a diesel for 10 1/2 years. At first our tt then our current 5er. We have been from Indiana to Oregon, to Utah, to Maryland and South Carolina and most states in between and north. We have used any and all service stations mentioned and never had a real problem.
I pay for my fuel with cash about 99% of the time so prepay is no issue with me. I usually need to walk and take a break anyway. Using big rig nozzles in my truck is also no problem and they have always cut off just like a smaller one. I have filled with and without the trailer attached while traveling.
Just this year we did 7k miles in 50 days and used all kinds of stations and never got bad fuel. In fact I have been lucky and never had bad fuel in any state we have refueled in. Its something I just don't worry about.
Also have not had problems finding fuel on any road we have traveled on, Interstate, US, or State.
We did a lot of traveling while I was on active duty for 20 years, from station to station and from those stations to Indiana on vacation with a gas vehicle and never had a break down or bad fuel.
I have been one lucky fellow and others have not been so. Travel on and happy trails.
