Ummmmmm, I've had a Woods 750 backhoe mounted on a Yanmar 155D for probably 15 years.

The tractor is a little lite in the front end so I put a large cast iron weight in the front loader. It has done yeomans duty for all this time with never a problem. I've used it to dig curtain drains, a small pond, well water pipe trenches, remove stumps and digging along fountation walls to add drainage material. It's the Energizer Bunny of mini backhoes. Most of this work has been done for other people as a cash business and it's paid for itself over and over.
Bill