Looking at some of these 4wheeler pics has me wondering - what's it cost to get into them? I see prices from $6k-10k for new honda/polaris rigs. I'm assuming used might be half that plus cost of trailer, helmets and stuff like that. Not knowing anything about them, am I likely to get a lemon looking on craigslist for used rigs? Not that I really need anything else to tow behind the jeep, but they look darn fun...