Below are links for everything you need to add brakes to your trailer.
www.ntdracing.com

https://www.amazon.com/shop/ntdracing
https://amzn.to/3UjiNGC Electric Brake Kit
Video about what is in the box    • Southwest Wheel 5-4.5" Bolt Circle 3,...  
https://amzn.to/3TjHgdv 7 way plug harness
https://amzn.to/3Tgn1NR Trailer Aid jack
   • etrailer | Dexter Electric Trailer Br...  
   • How To Adjust Trailer Brakes the Easy...