I have a lot of pick-up trucks and larger SUV type vehicles in my town. Even though it super simple to just drive straight in between the guide rails I still have them drive up onto the rails and hit the tire brush. Happens all the time. MarkVII is aware of the problem and their new machines...
I have 2 of these machines. Here are the pros and cons:
Pros: Simple design and not over engineered
Maintenance is easy
Cleanability is good and consistent but not perfect.
The wheel scrubbers work great
Software for remote resets and data capture are...