I got Supcases, I got one otter box with the first iPad I tried out and these seem to be basically the same thing for 1/4 the cost. They stay in the mounts anyway so the case is just to keep the dust from trashing them.
I use the Arkon locking adjustable mounts. I installed them with self tappers up by the driver side window in the step vans or I find a spot on the dash in the different trucks. If you use these you probably want to use some locktite or similar, the nuts have been slipping off and disappearing with the vibration in the trucks. These lock the tablets in, it’s not a heavy duty lock, can be beaten with a screwdriver if you really wanted to, but it keeps the package handlers or any passerby from easily walking away with the iPad.
I got everything on Amazon.
I’m liking the system so far and he just got approved as a VEDR vendor so that’ll be nice.