Thanks for the photos and information. You will want the Electric Trailer Brake Kit - Self-Adjusting - 10" - Left and Right Hand Assemblies - 3,500 lbs # AKEBRK-35-SA for self adjusting brakes that you won't need to check periodically to maintain or # AKEBRK-35 for manual adjustment like what you currently have. view full answer...
The best option I have for you to mount the frame brackets on the trailer frame for the Pro Series Weight Distribution System without interfering with the battery box would be with the Chain Hangers for Reese Weight Distribution Systems part # RP58305.
I would not have any shorter bolts that secure the standard frame brackets to the frame on the above weight distribution system. view full answer...