I detail the inside of semi trucks for the company and also keep up with personal belongings from the drivers who didn't get their stuff out before I cleaned them. I also make sure the yard around the shop is always clean and looking good.
I would change brakes, tires, oil changes and other mechanic work to the reefer engines if needed. I also repaired damage on the trailers inside and out. I fixed air leaks and wiring issues on the trailers as well.