Smith may not be tall as Todd Wade, but he can play the position. He has upper body bulk to add but his leg drive is excellent, as good as you need for a RT certainly. Wade Smith has been unfairly pidgeon-holed because of his athleticism. In reality the usual difference between the positions is who is better at pass protection because that person you put in at LT.
Right now I think Hopkins is better at pass protection than Smith. When Smith was drafted an AFC General Manager told a publication he liked the move and if he drafted him he would have him play RT for the first couple of years before moving him to LT, because he has good leg drive and can eventually play LT but first would be a pretty good RT.