My boat came with a 1999 Performance Trailers model number PC 20-21 and I have been very happy with the trailer.
http://www.performancetrailers.com/sailboat.htm

I have removed and replaced the lug nuts on the wheels about every two months, coated them with anti seize paste. I've repaced the grease a couple of times in the bearings (buddys). After my 5 years (3rd owner) of repeated dunking in salt water, the springs are about ready to flake apart. That is the only thing failing and that is because you don't make high carbon springs out of non-oxidizing materials.

GARY