gotta agree with mj, brakes on a boat are a waste.
having them on a trailer is a better idea...
i've never had them and never missed them until i got into a sudden stop situation on I-75 coming back from the keys. after that i always said if i ever trailer any distance, i'd have them. my commute is about 3 miles to the ramp, so i don't have them, but if i ever go on another long run, i'll have at least one axel done.
as far as rough vs smooth, i'd think smooth is better, but if they work and don't make noise, i'd leave em alone
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