Will the OEM Class IV Receiver assembly from an 04-up Ram 2500 bolt right on my 07 Ram 1500? Im talking about the one that replaces the bumper bar and bolts to the frame. There seems to be a lot of people reccomending that little class III (5000 LB) one but I'll be towing about 6000 LB minimum so thats out. There is a guy listing 2500 takeoffs on Ebay but he's not sure if it'll fit a 1500 or not. Does someone know for sure? Thanks!