Here's the deal. If something bad happens, any decent lawyer is going to sue everyone involved, including you as the easement holder -- whether or not you did anything wrong. If you have insurance, you don't have to worry about this risk. If you don't, then something could happen -- it's a risk you'd have to live with. So it basically boils down to how much a risk taker you are. Myself, I buy all the insurances every time I rent a car, because I'm always worrying about the worst case scenario. If you aren't much of a pessimistic person, then maybe you'd be O.K. without insurance. But you have to understand the embrace the risk.