Biggest reason I'm looking at installing one myself is because all of our stops are at truck stops, not exactly the best place to walk dogs or make a sandwich. I would much rather stop with the family at a rest area for a leg stretch than a Flying J.
Another reason, like was mentioned is getting off the interstate and making long highway runs, I just can't swing in the local 7-11 for a fill up and a slurpy at around 65ft in length.
Also, going up north last month I had two fill up's that were roughly $20 more than it cost around here. So that's $40 right there towards a larger tank.
