Do you work on your planes at home/shop or do you work on them at the field?  If you checkout and make repairs prior to going to the field then you won't need much more than what has been outlined as the "basics". If you are the type to just throw the stuff in and hope for the best then you will need a rolling box with all kinds of tools, spare parts, etc...etc... !  I've seen some guys who routinely  do this and they need a rolling shop truck  at the field to get their planes in the air!