How does it "mount" to the ground?

 

use a concrete drill and run some ancors, on my buddies for his rocket we just bolted it to a sheet of 3/4 ply and it works great as well

 

If you use plywood, make sure it's long enough to go under the rear wheel, too. That will keep it from sliding when you back out of it.

 

I use mine on a multi-use utility trailer. I was lucky enough that 2 of the bolt holes lined up with the cross piece of angle iron for extra strength. I also used stainless steel T- nuts from under the trailer so I don't have to crawl under the trailer to take it on and off.