That is interesting, thanks Curtis. I had no idea that adding another tank was this simple. I would like to hear more about the second filler door when you get to that point.

I may abandon the underhood WVO tank in favor of this one if I can work out a good filler system. The main reason I was going with an underhood tank was to eliminate the possibility of spilling WVO in the truck's interior (most people run a plastic "tank" in the cargo area when setting these systems up) which would be one awful, disgusting mess. I had not seriously considered adding another tank underneath until now.

As an aside, that frame looks amazingly clean. It is certainly a different world up here in the north with the road salt. my conversion Trooper is in good shape for a Minnesota vehicle, but it's nowhere near that clean. I plan on buying a very nice southern/western Trooper if this project works out and swapping the diesel gear into that one.