This it's a really old thread, but here's what I have. The end of my bucket, about 6 inches back from the front edge, is a hole. Then I have a couple bits of 1/2 plate above and below the bucket, with a big bolt going down through it. To this I welded a square tubing section to it for a 2" ball mount. Most of mine just came that way when I bought it. I added the square tubing.
Now I can swap lots of accessories, and if I'm in a pinch, I can still move some materials with the mount installed.
My opinion on ball mounts... The farther away from the truck, the more visiblity you have, and the more movement side to side of the trailer you can get (with the longer lever action). On the end of forks I think is too far out, and you might stress the forks. Too close and you can't get enough swing out of the trailer tongue.
End of the bucket is just right for me. I can also scoop under a trailer tongue that's laying on the ground (most of the time).