I did a bunch of work on my trailer when I bought it. Orlandi trailer in San Jose (Winchester & 280) did the actual repair--they do high-quality work for a fair price and quickly too. I bought all the parts (new keel rest, 4 new hull supports) directly from Trail-rite. Orlandi will do lights, etc as well.

A boatyard can probably do the simple stuff like the keel support for you as well...