Hey there. I've got a 2001 Dodge Ram 4x4 Sport Off Road with a dealer factory 3" lift. My tire size is 315x70xr17. Does anyone know what drop I would need on my receiver hitch? I know it's going to be one of the big ones, but I don't know for sure which one, and don't want to have to buy several to find out - if I can help it.