You will be adding over 500 + lb to the bed of your truck. I can get 300 + miles on my stock tank, and you will be getting better MPG's than I do.
I just don't see the need for it. You need to be stopping the truck every two hours and taking a walk around the truck & trailer any ways.
Have fun.
Hey WD;
I like the ability to have options. With extra fuel, you can choose which places to stop for fuel. Many times, we have come to service stations "in our car" and found that the stations had cars lined up ten deep. It would be nice to "drive on by" ...Or like Needles, where fuel is $4.20 per gallon, it will be nice to smile as I go by. When we go to Alaska, it will be appreciated, also during the summers we plan to spend them on the coast, where the fuel is very high all the time, and access is not always the best.
Basically we purchased it for convenience for our long trips. 500 lbs. is not that big of a deal, and as you drive it gets lighter.
We normally plan our stops at rest areas, and they don't normally have fuel stations close by. We like to take our time, walk the dog, eat lunch or a snack, then get back up on the road. At each rest stop, I could top off our main tank.