When someone tell's you that they are experienced in ATV's that dosn't mean they know how to drive a Rhino. The ATV is way different from a UTV. They both drive and ride totally differnt. So the question should alway's be, have you ever driven a utv? and if no, give them the low down on driving. and if yes, how experianced are you. Then go from there.
Me personally I don't like having passagers with incase there was a mishap. I wouldn't want to be the one to have to live with myself if something like that would happen.