Auxiliary gas tank

My 2005 chevy has the 26 gallon tank also. I try to fill up at a 1/4 of a tank so around 200 miles between gas stops. At least with the Diesel I can get to truck stops and not have to worry about height restrictions. I agree that $1000 and up is too much for a gas tank on a 12 year old truck. I looked at portable ones and most of them don't look wide enough for the diesel can. I decided to just get a couple of these and then if I stop somewhere I can just top off the truck tank.
https://www.amazon.com/VP-Racing-Fuels-3552-Utility/dp/B003TTTIZ2/ref=sr_1_5?ie=UTF8&qid=1485377680&sr=8-5&keywords=vp+fuel+jugs