Bought my boat but it didn't come with brakes. Added them last year (electric) and they have made a huge difference. Originally was towing with a GMC Sierra but stopping was marginal without trailer brakes. Added the trailer brakes and stopping became much better (already had a controller for another trailer I have). My boat package was supposed to be under Ohio's 3000 lb limit on boat trailers but when I weighed it on a CAT scale is came to over 3100 lbs (without all my fishing gear or cooler in it and only 1/2 tank of fuel).
Purchased a new Chevy Colorado (Diesel) with an integrated brake controller that makes the brakes act like surge brakes. The harder I press the pedal the more power goes to the trailer brakes. It's the best of both worlds. Six brakes slowing you down is much better than only four.