Your going to have two major problems. The 6 inch lift if from springs could mean your truck basically will have too soft of a suspension to handle the load. Second 6 inches is the recomended minimuum recomended clearence between truck and trailer. So in essence you will have ZERO clearence. Likely making it impossible to hitch up, much less attempt to drive down the road with it.
On top of all the other mistakes you have made, if this is a 2500HD and not a 3500 even in stock form, which it is not, you likely will be overloaded just a bare bones trailer.
