My Allison transmission service center had me set for 8am. I was there and waited in the RV until 4pm, finally got out about 7pm. We are not high on the priority list, at least until time to pay. In their defense, they had a rig in the bay with the pit that was waiting on a part and it could not move. Finally decided to put me in a bay with out pit and do it on the ground. Chit happens so I dealt with it. My Freightliner dealer gave me an evening appointment which I like better, in at 5pm and out about 8-9pm and don't feel as much like I am in the way.