I am sure you will get lots of replies. I have a few quick thoughts/cautions off the top of my head:
- Having 2 gallons of liquid on the front might be too much weight for the front end.
- I would consider sticking with the stock front and rear sprockets unless you have some special reason to re-gear. Especially if you are going to be spending some time off-road and are expecting to encounter hills and headwinds on-road. Get some seat time with your full load before your trip and evaluate.
- I would add an inline fuel filter between the petcock and the carb - it is cheap and easy insurance.
Sounds like fun.