Another vote for the RDS gravity feed tank. We've had ours for over 4 years now, I had to pull it out of the old truck and instal in the new truck, we LOVE it!
The install kit you'll have to get for the tank comes with a check valve, I haven't yet had an "over - flow" situation!
It's nice to be able to get fuel when it's convent for you and not when you "have" to get it. Like B. O. stated I usually get the trailer situated at the CG then take a run for fuel if I need it, Sure is nice not having to be concerned with pulling the trailer through the fuel islands.
Dan