RDS cargo area tank(I believe it was a retro fitted under deck tank,but it works great for me). I was one of the first,if not the first person to put a V3 (Vegistroke) in a Excursion,at the time they did not have there underbody tanks yet.This tank is flush to the third row seat when folded down,and I often forget its there.I built a shelf over it and I put a indian blanket folded over the shelf(it looks like a little bed for the dog,and she likes the warmth).I get real quick switch over times as well (fuel doesn't really ever get cold inside X.I think it is still a option,just not very popular.I love it living in NH with cold winters,and it keeps the back of the rig warm too............
