arcteryx
Adventurer
This is a very nice long range tank from a FJ60. Unsure if this was a custom one or mass produced. It is 14x 26 1/4 x 34 in size, which comes to about 54 gallons. The inside is very clean, see pics. It was held on by hooks/mounts that were welded to the frame, so you would have to do this or come up with another way to mount it. You can see the 4 attach points in the pic though. It does have a skid plate on the bottom to protect it. Located in Austin- $700 + shipping if needed
You can see pics of it here http://www.cruiseryard.com/60-series-54-gallon-long-range-tank/
You can see pics of it here http://www.cruiseryard.com/60-series-54-gallon-long-range-tank/