I used to mount mine on the front grill guard I had. I made two 90 degree brackets, bolted one side to the grill guard, and mounted a long bolt to the other side of the bracket and bolted the jack to it.
Old mount
![](http://img.photobucket.com/albums/v33/Snowtoy/Other/OldMnt2.jpg)
I have since built my own custom bumper and built a cradle to hold the Hi-lift.
![](http://img.photobucket.com/albums/v33/Snowtoy/Other/NewMountcopy.jpg)
If you don't have a way to mount it externally, bolting it to the roll bar would be about the easiest way of securing it.