At last something that Eric hasn't covered!
Chris had this already attached to his mule when I collected which was a great help. Very simple to fit, keep the outside two uprights level with the boot lip and central then grip with a pair of mole grips. I then levelled it up with a spirit level, or the modern version off, there is an iPhone app for a spirit level, it is free and very useful.
Once gripped just drill through and attack with self tapping bolts, it really is as easy as that.
I've got the posting pictures sorted now, in fact it is so easy I thought I might post up all my thousands of holiday snaps, starting with a picture of me in my mankini, if you all send me money, I promise not to