I use my Garmin GPS data base, looking ahead for fuel stations, and call ahead and ask if they do indeed have diesel, and have room to pull a 40' fifthwheel through their station. Only once has one of them told me it wouldn't be a problem, and got there finding it to be a postage stamp and impossible to get in and out of without backing back out onto the highway. Several have turned me away saying they were either packed full, or too small, and lots have said, we don't have diesel. I have wanted to get "The Next Exit" to help with selection, but noticed it doesn't state much about getting in and out of places.