Tiffy,
If I understand it right, maybe you are referring to some sort of quick way to attach different implements in the place of the bucket. I did a quick search and found some patents, but no products. If he were simply talking about a "modified hitch" then it could be anything that he has worked out in his mind. He probably has a specific thing in mind and would be impossible for me to guess what that might be. In this case it would be better to ask him point blank what it is he wants and what is holding him back from getting it. If the hold back is money, then offer it to him as a gift. He will appreciate it all the more because you want to give something that will help him.
Mike