Hey Marty, for your 5,200 lb Dexter Axle you can use the etrailer Electric Trailer Brakes # AKEBRK-7-SA. These brakes will work with 5.2 to 7,000 lb axles, measures 12" x 2", and will work with 14 1/2", 15", 16", and 16 1/2" wheels.
Also, the hardware you need is # BRKH12, and the wiring you need is the 10 Gauge Primary Wire # 10-1-1. view full answer...