Why would running solid tires with OTT snap an axle?
They don't have any give like a pneumatic tire.
I run a set of loegering OTT on a bobcat 753. Mud, sand, snow, ice, they make that little machine into a powerhouse. Before I put the tracks on, it couldn't move itself, now I power right through and get my work done. They're fairly easy to get on and off. I can put them on by myself in 30 minutes or less, and like 10 to get them off. They are heavy to maneuver when off the machine. Also, the pins and connecting links wear, but they're meant to be the consumable part. The pads are fairly heavy duty and seem last quite well.
Only issue I've really had was operating in a wet, sticky snow. Suddenly my machine started growing taller as the wet snow froze to the cold tracks. Caused some binding issues, but a pry bar broke it up quick and I just stopped running until the snow froze up better.