Now to keep this simple, You drive into the crusher and park your vehicle behind a plane.
There are two controls. Engine ignition and Throttle modes. Minimum/Low, Medium, and Maximum Throttle.
Jet engines from a 747, or an A380, or hell even an AN-225 Would build up thrust until the desired throttle modes, for instance: maximum throttle. Therefore your car starts tumbling down or rolling down the field/area for it to be destroyed.
I think a 747 would be boring as the 4 engines only make 40,000lbs of thrust. All 4 put out 160,000lbs of thrust. Now for the A380, it can make 70,000lbs of thrust, All 4 would put out 280,000lbs of thrust which still sounds a lot but I think the AN-225 might be cooler though since 51,590lbs of thrust on 6 engines which would give 309,600lbs of thrust. It’s 30,000 more than the a380 but yeah. I’d bet that tier 3’s would be tossed around easily if the AN-225 was used. But downscaling to an A380 or a 747 is okay for me 
Due to how big the crusher can be, the most logical place for it to be used would be the Airport similar to the mythbuster’s test facility which looked like an airport. If there are any plans of increasing the server size to the point where the chinhook (the helicopter) coudnt carry that many players, This crusher can be used as a way to escape the core explosion. Alternatively the plane’s ramp would be down until it can takeoff similar to the video below.
Straightforward example on how the crusher can work:
Full Episode
