I've tried all the new apps and albeit it might be a tad helpful with the fuel lanes but I've yet to find one that alerts for the incline of the driveway in.
I have just come to the conclusion that a drive by is a necessary evil when assessing which gas station to use when driving a big coach whether you can even get up the driveway without dragging and/or get out after fueling when towing.
So far I have yet to be disappointed at Loves Truck Stops. Haven't come across one yet that didn't have a nice flat entrance to it and real nice wide fuel lanes and always plenty of room from pump to the parked cars to make the turn out.
Pilot and Flying J are on my banned list. Do not ever use them. Flying J,You might get in but you'll never get out with those parked cars along the front. And Pilot, well they are going up all over on postage stamp size lots that you can barely get a car in to fuel nowadays.