Two words, Workman's Compensation.

Having driven and used one of these, than can be finicky if you have a steep slope as mentioned above... But It's awesome to drive and you can do some cool things other than half pipes with them.

Bird kill is a problem, and particularly since the wind power industry has sone a good job of passing off shoddy studies about bird kill. Where they only check for dead birds on the weekend, or once a week, and pretend that scavengers don't exist.