A vision system for a vehicle towing a trailer includes a camera disposed at a rear portion of the trailer and viewing rearward of the trailer. A trailer antenna is disposed at the trailer and in data communication with the camera, and a vehicle antenna is disposed at the vehicle and in data communication with a control unit disposed at the vehicle. The trailer antenna is operable to transmit signals representative of image data captured by the camera toward a road surface along which the vehicle and trailer are traveling so that the transmitted signals reflect off of the road surface and toward the vehicle antenna disposed at the vehicle. The vehicle antenna receives the reflected RF signals and communicates data to the control unit that are representative of the received reflected signals.