Well... I had a B7100 with a backhoe for 9 years. The sadest and happiest day of my life with tractors came the day I traded my B7100 for a B2410. The 2410 is all I hoped for and more, but the B7100 is one tough little machine.I had a Woods 650 TPH hoe. I also ran a Woods 750 on it for a while. The 750 is definatly too big (wheel stands and all). The 650 is almost too big. I can't help you with any Kubota hoe stuff cause I just never had one.But to your questions -1. How easy is it to get parts for this unit?I never had any problems at all. We even ordered stuff from the factory (heavy duty top link attachment bracket, required for TPH hoe). Most everything is available. This model tractor is the highest production model in the Kubota line.2. Is this unit too small to run a backhoe? He's going to use it for landscaping and digging trenches for waterlines, etc.I used my hoe for everything you can imagine. Once I dug a 900 foot trench for a neighbor up the center of his gravel driveway. The subase was packed 5 inch stone, topped with crusher run and washed gravel. No problem. Now that is not to say that you don't have to move at a reasonable pace, and be a little careful if you have a TPH mounted system.I would recommend you get a hoe that has a subframe. The extra expence is WELL worth the money. I also used to routinly dig out and push over 100 foot trees with the B7100 and hoe. Also you MUST have a loader or something VERY heavy out front. It will do what you want but it will be slower than a larger machine.