I'm thinking of putting a set of PROGRESSIVE SHOCKS 412 12" on my VRSCD but don't know if it will be right for my bike. I have a 240 conversion on the rear and don't want it to rub. I live in a city so potholes and dips are all over the place. any advice would be helpful. also, would you go with standard or heavy duty?? I'm about 200lbs and have an occassional rider on the back.