A good circuit tester, wire stripper and crimper. Either a butane torch or heatgun to shrink terminals. Slack adjuster wrench and release tool. Vise grips and prybar for the springs. A good 4 lb hand sledge and a smaller ball pein. Long handle punches and chisels. Impact driver , that you smack with a hammer. Philips, torx and hex bits. The majority of fasteners will be sae, unless you are working on reefér units. A long 24" flexhead ratchet with a 1-1/8" socket for air springs. Get a decent dual angle tire Chuck, and put about a 6" steel pipe extension on it , between the air ******. Thin putty knives if you will be changing door seals. Also a good cordless drill and bits, especially 1/4" and 17/64". An end nipper for pulling plastic rivits and a good length side cutters.