First preference is to get fuel without trailer attatched. If that is not possible then it is whoever has the best price provided they are not too far off the highway.
Sometimes driving a mile or so off the highway is well worthwhile. Been in a few tightfit stations but never one not doable.
Biggest pain are the cars that go to the end gas/diesel pump when there are plenty of gas only pumps in the middle islands available. No choice on where to go when you are diesel & the diesel pump is usually at the end for a reason.