@swatski suggested picking up CRC 6-56 in a thread around here somewhere. I got a gallon of the stuff, put some in a spray bottle, and I spray down anything on the trailer that goes in the water. Not sure how much longer it'll keep things moving along in salt water (I'm in fresh water only), but thus far, I'm sold on the stuff.
Not sure why the price is so high on those, but it might be due to what seems to be a boat buying frenzy right now - I got the refurbished stainless set for $56, but I know for certain that they weren't more than $70 at the time. I bought refurbished because I figured there couldn't be much, if anything, that could go wrong with them since they were still in the original packaging. I remember thinking that if there were any chance for bad used products, I'd just buy new to avoid problems. Those stainless ones are currently sitting at $125, with a "used" set selling for $73. My guess is that if you can deal with the crapstraps they send with the boat, wait out the market and buy a set when the price comes down, or buy a used set to save a few bucks right now.
I also stopped using the poles for the cover. I bought a 5' beach ball for the cockpit area, and got a good deal on two 3' beach balls for the front seating area. We take the balls with us if we're going to a sandbar (deflated), or throw them on the porch if we don't feel like deflating them for the day. The boat looks like it's got boobs up front when the cover's on, and everything seems to shed water just as well, if not better, than the pole system that came with the boat.