What Can I Add to My Boat Trailer to Make Loading My Boat Easier in Saltwater with High Winds?  

The guide ons helped greatly in the wind. I mounted them very close to the boat so the boat was centered when I pulled it out of the water. My boat trailer wasn't very good at centering the boat.

There's many factors that go into helping you get your boat onto the trailer from the water. The side bunks I got I had to bend a little to make the boat fit a little tighter to the lower part of the hull. The angle when the bottom was parallel to the frame it made the sides spread too far. There good but you may need to tune a little.

I have two boats. One is a Ranger bass boat with a Ranger trailer customized to the hull of the boat. This boat is impossible to load incorrectly as the bottom bunk rails self-correct the boat every time. There are two bunks that guide the bow and two that guide the stern end. So if you have the skills to customize the bottom bunks that is your best bet but this requires a boat lift and metal fabrication and welding skills. My second boat is an aluminum 13’ Gregor with a mismatched trailer. It only had two bottom bunks under the stern with three rubber dumbbell shaped guides on its midline and two guide poles similar to your PCV poles. This boat was very difficult to get centered. The guide poles are only a visual reference but have no physical function in centering the boat. The best option for this boat would have been to fabricate a second pair of lower bunks to control the bow. The alternative option for me was to purchase the side bunk rails from E-trailer and install them tight and close to the side of the stern end of the boat. This was simple, affordable, and did not require a lift to remove the boat from the trailer. The build quality was good and the strength was more than adequate for this small boat. It greatly improved the ease of loading the boat. Not perfect as the bow is not corrected by the side rails but much easier than before. The square tubing dimensions and gauge of metal would be adequate for a typical bass or ski boat but could be inadequate for something much larger. The finish is good but cannot comment on how well it will hold up to salt water. I primed, and painted the exposed nuts and bolts followed by a third coat of rattle can rubberized automotive undercoating spray which keeps them from rusting so far and prevents things from loosening. So if you are looking for something simple and affordable with an easy install this is a good start and should improve your loading issues.