I can tell you that the hitch takes about 15 minutes to install, it's 4 bolts and you plug the wiring into the tail light harness. My dealer wanted $100 to install. The side steps wouldn't be very hard either. The other 2 things you are probably at their mercy, but that labor rate is decent.
ETA: Any time I've bought parts for a new vehicle my salesman has put them in his name and got them at cost for me.