I love my 40 gallon auxiliary tank, it allows me to pick my stopping points and don't have to spend time in noisy, stinky truck stops because I know I can get in and out easily with the 5th wheel attached. I fuel up at the end of the day after the truck is unhitched, easy peasy. And I figure I use fuel more often than I use tools. :)
Since we use the truck almost exclusively for towing it sits for several months between usage. Usually from the end of October to the middle of May usually. If I can remember I put in some fuel treatment when I fill the tanks for winter, but sometimes I forget. It's never been an issue in over 8 years. I always keep the tanks full to lessen condensation in the tanks. Just old school thinking maybe, but so far so good.
