Depending on the doo sled you own its around 300-350 for just a two upper seat with no backrest and handles gizmo. Kids can either hold on to your waist or the strap that,s mounted on the seat. Its almost a stealth 2 upper when you see one.
Oh I forgot I didn’t have to get heavier springs I am actually on the lowest spring setting in the rear skid and I am no small dude.. titan has been turn key ready..