Hi Joe,
We have a King Salt Water Series trailer for our 25. It has given us good service (with around 40,000 miles on it). We added electric over hydraulic brake acutator, and had to weld a couple of the supports (after a particularly nasty drive on NY roads).
I service the bearings before each major trip, and always give them time to cool before launching. We rinse thoroughly after each salt dipping. I have put spray on galvanizing on areas where needed. Replacement items: winch straps and tires (on our third set now) get replaced as necessary.
I had to add a support to keep the bow post in place early on, but otherwise it has been mostly normal maintenance.
I don't know how many more coast to coast tows I have in me, but I have been known to say, "The best accessory for these boats is the trailer." Love may be a strong word, but this trailer has been a champ.
Best wishes,
Jim B.