It may be a little late for this, but might I suggest adding a removable panel under the back seat for fuel tank access, like the later 4Runners have? Seems like it might save some headaches down the road.

My Truck: 1987 XtraCab DLX 22R 4WD 5 Speed Manual
"Speed has never killed anyone. Suddenly becoming stationary, that's what gets you." -Jeremy Clarkson