I looked up your trailer and it looks like it has a GVWR of 5,700 lbs which likely means you have 3,500 lb axles so the etrailer Electric Trailer Brakes # AKEBRK-35-SA would work fine.
These brakes are self-adjusting meaning you won't have to periodically adjust them, will work with 13" to 15" wheels, and includes both the left and right hand side. view full answer...