The best way is to use Electric over hydraulic trailer kits. Typical electric brakes (drum) are not popular for boat trailer since boat trailer has to go down under water. Electric over hydraulic system use an electrical actuator, which works with your brake controller in the truck. This actuator will work with your hydraulic brake in your boat trailer. They are not cheap but you can purchase these kits from large trailer shop such as Trailer Parts Superstore.
http://shop.easternmarine.com/index.cfm ... goryID=309One issue is you need an Engager Breakaway kit to make DOT regal.
http://www.northerntool.com/webapp/wcs/ ... _200242374Another solution is to replace all brake comportment using Fulton’s Sharkskin Marine grade electrical brake system…
http://www.fultonperformance.comBrake & Controller Catalog page 16-27
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