A lot of people seem to pack for survival under any conditions. Reality is that you are just using a vehicle slower than a car, and stopping at different points along the way for food or other supplies is just part of the fun. When I travel by bike, I am not going off to the uncharted wilderness so I end up carrying less than I do when I backpack. You can stop and do laundry while you have lunch one day, that eliminates a lot. Other than that just carry the basics of camping. I have a popular post about it on my blog also.

Marc