Hey Darksiders out there, I have a buddy (not a forum member) that has an 02 1800C, stock rim. He goes about 300lbs and his girlfriend goes about 200. When they go on a long trip with luggage you can just imagine the kind of weight they're putting on that bike. He's wearing out tires about as quick as he can put them on. I suggested he try a car tire if nothing else but for the cost advantage. So here's the input I'm looking for. What brand and size are you using ?..especially you guys with a C model. He is currantly using a Metz 200. Any suggestions to handle the weight would be appreciated as well.