Yes, even with the heavy duty bucket, you ought to add reinforcement. Many of us have seen heavy duty buckets bent in the middle.
And I agree with the other comment about not lifting a heavy load all on one side. I had a JD mechanic tell me that they have seen several guys with twisted loader frames from lifting way off center, usually with chain hooks, and there isn't really anything they can easily do to fix it. You just have to try to tweak it the opposite way a bit harder, and they don't like to be responsible for that.
Some dealers will not install non-factory add-ons like chain hooks, for liability reasons. One dealer told me that a dealer that would put chain hooks on ought to have his head examined, that he is asking for a lawsuit these days.
Whacky world! /forums/images/graemlins/wink.gif
So far, I've found pallet forks for my loader more useful than the bucket for lifting things, and I think I will add chain hooks to my pallet fork frame which is already some very heavy gauge tubing that shouldn't need reinforcing.