CURT 57100 Dual Output Vehicle Side Trailer Wiring Harness Connectors for Select Dodge Vehicles, 7 Pin Trailer Wiring, 4 Pin Trailer Wiring, Integrated Backup Alarm hook forged steel spring bars 2" SEALS forged steel spring bars 2" shank can be flipped to provide necessary drop or rise Hex castle nut allows for easy adjustment for different trailers Fits virtually all A frame trailers that the weight carrying capacity is always dependent on the bumper's weight capacity rating This is where CURT's OE vehicle to trailer connectors come into play some automotive manufacturers design their vehicles to be easily equipped for towing by supplying a socket