Also, the guys from rotopax are super helpful. You can google their headquarters in Utah and get a phone number. They should be able to help with any details you have.
Actually, we have ours on the tail. would think sideways would work ok but have not tried it. Its good idea to vent them especially on hot days, we forgot on one trip and they swelled up so it became veryt difficult to remove them from the mount. Good luck
I have a ‘91 80 series with an LS-3 engine swap and she is a thirsty girl. I’ve got the stock 22 gallon tank and 2 -4.5 gallon rotopax. However, I really could use more fuel capacity. What options have you found work well?