We are exploring purchasing a UTV for search and rescue operations. I do not know much about these and definitely don't know how to intelligently compare the models. Is a 4x4 or 6x6 better off-road? Does the 4x4 or the 6x6 perform better? We will be using the vehicle only once a month or so, but when we do, we'll be using it hard. It will be used to access rural areas that involve mountains and poorly maintained trails. It will need to get through mud, gravel, snow, and occasionally cross streams. It must have a cargo area that can carry around 600lbs or more and accept a 2" ball hitch. It also has to accept or come with a winch (4,000 lbs or more would be good). Ideally, I would like to be able to attach a plow and take care of the parking lot as well. I appreciate any adivice you can share. Thanks!