Auxillary/transfer fuel tank in pickup used for generator

Roy plan on running it anywhere I choose one of the reasons I gave up neighbors and went full time :) but probably won't ever be in one spot long enough to run it that long but if I'm going to add extra fuel tank why not go bigger plus plan on using it in the future to build barn fence horse stall hunting cabin ect.. Just mainly don't want to be in a rest area or truck stop for a day or so and have to get up out of bed and refuel.