I just posted about forks on another post today. However, you might want to think about getting some debris forks instead of just two pallet forks. The multi-tine forks work great for pallets and are very versatile.
I just looked on Ebay and other sites for forks and they all seem to hook to the bucked with a clamp. I would suggest that instead of a clamp in the bucket, use chains that go around the back of the bucket and secure with a binder. The problem with an inner clamp is that if you're hauling brush, stuff will get into the bucket, hang on the clamp handle, and loosen the clamp when you dump it. If the forks are secured with a chain around the back, this problem won't happen. Since they all seem to be clamps now, you can easily add a chain by tying a chain to the underside of the clamp and bring it around behind and over the bucket. Secure it to the top of the clamp with a binder. Loosening clamp problem solved!
I, also, use Rotella that I pick up from Walmart. Tractor has run perfectly for over 10 years.