Tedd-
I've got the BIG DMI on my pickup, it's spring loaded and can be unlatched to float so you can hook up to a trailer easier. When you pull away with it, it finds center and latches back into place.
FWIW, after you're used to your vehicle and have a good reference point and "feel" for hooking up you don't really need the float option, but it's handy.
After you have one, you'll get to dislike reciever hitches, the DMI bumpers like mine are all the same, just use differnt hardware to mate from vehicle to vehicle, I had been looking at a Super Duty and all I was told I had to do is buy the adapter kit and the one from my '90 F250 would go right on.
Given, for a couple Cubs, they're overkill, for hauling a car, they're GREAT.