Beware of lending your forklift to a neighbour

This one is for managers to think about.  We all like to be good neighbours but what if the warehouse next door wants to borrow your forklift (because their own is broken, perhaps)?  Are their operators trained?  Who is liable if their operator has an accident on your machine?  While a good neighbour does not bring in a lawyer to draft a contract for this kind of exercise, some questions should be asked before you just say yes.