I have a RDS 40 gallon aux tank/tool box and love it. I now carry about 78 gallons in total. I fuel up at the end of the day after I get all set up. Lots of times I'm going for dinner or a grocery store so it's not really an extra trip. The Gas Buddy app is my friend.
It's nice not to be concerned with fuel during my daily driving. I still need bathroom breaks, but if on an interstate, there are rest stops. If on a major highway, just pull over near a station or Mcdonalds, etc. Easy.
I used the gravity flow kit RDS sells to hook up to the truck's OEM system - works well.
Tim
