i'm bringing a decent fractional-inch tool set (3/8 socket set, 1/4..15/16 combo wrenches, etc etc), critical spares (3psi electric fuel pump, some cooling system parts, special stuff), plus misc hardware and electrical parts, automotive DVM, roll of baling wire, some chemicals (JB weld, ultra grey RTV, brake fluid), ratchet strap, hand tire pump (i have air springs), towels. hitchhikers guide to the galaxy is correct, towels kick ass. beats laying on 160F asphalt. mucho water (for drinking and handouts to non-desert folk). i'm also bringing my cot and sleeping bag and a tarp. i guess i'll toss in jumper cables. i will likely get paranoid at the last minute and add spare engine block, 9000 lbs of rusty bolts, 11 jack stands, and other loose objects that will rattle around in the trunk but never get used.
paper maps, locus map for phone (aesthetically displeasing but works offline), Xiaomi Yi action camera, mounted, clip board, blue masking tape, binder clips (lurching for route sheets circulating in cockpit gales cause severe road wander and invites death). 8000 mAh USB (thanks for the tip david) for the consumer electronics (tho i have USB power in car). flashlights (two) plus batteries. canned japanese coffee. modafinil and aspirin. maybe some scotch. cash.
hmm i have no (car) jack at all, i spoze i should buy a light one. dammit. my steel one is heavy, and so ugly it embarrasses me. i stopped carrying a spare tire years ago from lack of need (famous last words).
i'm open to suggestions.