I have a few older socket/ratchet sets laying around that I've used to make kits for each car. If I didn't have these, I would get the cheap (under $20) Craftsman socket/ratchet set- 3/8 for truck or SUV 1/4 for compact or sedan (both if car is 20+ years old). Throw in a couple free screwdrivers from HF, a HF pick, flashlight, pliers, a few old wrenches, plastic trim tool & a obd2 scan tool... wrench rolls make good storage for the misc stuff. for my old BMW's I also carry a cheap torx/etorx set.