You could just get a backhoe designed to mount to a skidsteer and attach it to the front loader. Lots of companies make them, e.g., Bradco, Bobcat. It might not be recommended for a Toolcat because the front loader is weaker than a skidsteer's. I doubt there's enough frame to put something on the back. There's a company that makes something called the Farm Boy HD that puts 3pt on the 5600 and, in theory, you could put a 3pt backhoe on it. I wouldn't try it though.