rogerdddddd, re-read and think about what you just asked after reading this:
You buy diesel and gas at a fuel station, dispense into a fuel can then put it in the back of your car or truck and drive home, or whereever you need to with it. You fill your cans for the RV and drive where ever you need to with it.
You and everyone else in the world, literally, has been doing this since you could drive and needed a can of gas for the lawn-mower. (If your one of the few people who's life experiences hasn't allowed you to do this, because there's always one, realize that everyone else does.)
Short and long answer is no problem.
