converting to disc trailer brakes?

I have done somne research on installing Discs on my 1990 trailer. Early models had some problems with warping but no-longer. They are a bolt-on retrofit. The caliper support will bolt directly to the existing backing plate mount on the the axle shaft. You will have to get flex brake lines to extend the existing lines to the the calipers. Check out Tie Down Eng at Tiedown.com for the latest in Stainless Steel discs.
Another suggestion is to flush out all of the old brake fluid and switch to a silicon based brake fluid. Unlike regular brake fluid this will not absorb water, is non-corrosive, and will keep seals like new for years. While your at it also check out oil filled hubs also available Tie Down and Liqualube Inc. Never grease a bearing again.   

In the FWIW catagory: I just picked up a complete set of two drum brake assemblies (ready to bolt on including backing plate and wheel cylinder) for only $47.00/ea. These are the free backing drum setup that will eliminate having to use the back-up lock out feature on the coupler. I could not believe how cheap the complete assembly was...simply amazing. I picked them up from my local trailer manufacturer (Magnum) who I bet are not the cheapest around.