My dealership is also a big welding shop. In fact the name is Franklin Equipment and Welding. I asked them if I needed to reinforce the heavy duty bucket in anyway. The welding guys said it was not necessary at all with the rounded lip.
I had them weld 3 hooks on. I had a grab hook on either end and a slip hook in the middle. I was worried it was overkill, but I am really glad now that I did it this way. For most things, I use the two grab hooks. But when hauling brush that is too long to fit in the bucket, the center hook is great. I loop the chain through it, around the brush, and then lock it to the grab hooks. The slip hook lets the chain center itself.
Attached is a pic of my hooks.
--Brad