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My trailer had drum brakes that were somewhat corroded when I purchased in 2002. They are surge actvated. I had a feeling they weren't helping much so in 2005 I replaced them myself with stainless steel disc brakes. One of the primary reasons for going with disc is that the brakes are exposed and more easily cleaned. They are also ore effective. I carry a pump sprayer with a mix of simple green in my truck and I take 5 minutes to spray down all moving parts on the trailer after dunking so it is not sitting for a day/all weekend before I get it home to do a final wash. My brakes are currently as good as when I put them on in 2005. Stainless steel has made a difference.
Oh and by the way, the disc brakes made a HUGE difference. I had to install a reversing celanoid so that when the truck goes into reverse a valve opens that dumps the fluid out of the surge cyclinder as it is compressed. This way you are not backing up and applying the trailer brakes at the same time.
I would recommend this setup and to do it yourself. It is really not a hard job. Just be careful of the edge of the discs they are very sharp.
My boat is 22 feet and I think it weighs about 7500 lbs fully loaded with fuel and equipment including the trailer.
Good luck!
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