I'm trying to work out a trade on one right now for the kind of stuff you are doing. I don't need it to cut any grass, I need a mule. tow a dump trailer, gravel, firewood, move a down tree, hual gear to hang stands, I am with you there. Leave one for domestic work and one for mule work. Are they perhaps the same model? That would also leave interchangable parts if needed. Maybe the starter dies on one and the steering on the other, swap as needed, to keep you up and running, and it gives you time to repair it properly with out the rush of I NEED IT NOW!
The only real difference between a good tracker and a bad tracker is observation. All the same data is present for both. The rest is understanding what you are seeing.