Great advice so far.
Not sure if this has been said yet, but in my opinion, I will opt for a station with a higher price per gallon if the access is better. It's just not worth the heartache of possible damage, or even the stress of causing that damage, to save a few bucks. Usually I fill with about 50 gallons of gas while on the road. Even if the price difference is $0.20 per gallon, that amounts to about $10. That amount is trivial in the overall operating expense & vacation budget. Heck, $10 doesn't even feed one of the (fully grown) kids at MacDonalds! LOL
While the cost is higher, many times the stations which are right on a major highway often have better access, too. You'll pay a bit more, but again, much lower stress.
I start looking for potential spots about 50 miles or so before I really want to fill up. And even then, I'd have 20-25 gallons left in the tank.
~Rick