I have seen a lot of ways to attach a hook to a bucket but here is what I like to do. Get a thick piece of flat steel and bend it to fit the shape of the bucket. Weld it to the bucket and then weld the hook to that. Gives a lot more strength and is cleaner looking as not all buckets conform to the hook but the plate does. For these types of install I look real hard to try and find a USA made grade 70 hook and not an import.
This may be old news but I have not seen this way on this board before so I hope this is not a duplicate.