Here's what I carry...I always have a second set of everything needed to do a tune up (plugs, wires, cap, rotor, points & condenser) as well as water pump, fan belt and fuel pump.
I also like to have a couple 10' long pieces of #14 gauge wire with misc but splices, ring/fork terminals, fuses and electric tape. I even have a pack of misc universal springs with the long tail on one that can be used for clutch, brake and throttle return springs in a pinch...you cut them to length and there are a few different sizes for different tensions.
Don't forget PB Blaster, rags, and Tub-o-Towels (hand cleaner of your choice).
Should go without saying, but make sure you carry a spare tire with jack and lug wrench.
In 2012 I did the ATHS Historic Highway Convoy from Morris, IL to San Bernandino, CA over 10 days. We had 35 antique trucks in the convoy. We had a start time and finish time everyday, but the in between time was ours, so we stopped at junk yards and car museums we saw along the way. The first Truck Stop in MN has a nice car museum inside, so make that's one of your stops. This was the trip of a life time for me!
Also, don't forget to "stand on a corner in Winslow, Arizona" and get a picture of the "flatbed Ford"...and stop at Cadillac Ranch in Amarillo, TX.
Take a camera and have fun!
Mike B
