The previous owner of our R-23 chose the LOAD RITE ALUMINUM AB BUNK MODEL #LR-AB26T6700102LTB.
The Galvanized Steel Bunk-Tube Supports are unique to this manufacturer and add strength to this critical area while still automatically adjusting the bunk to the boat as she settles on. The target bunks up front and PVC Side Guides truly help "catch and hold" the boat during recovery at the ramp.
We live in Arizona and there are no dealers out west but we have found the factory service department at LOAD RITE and the part support on the factory website to be excellent. We added two additional bunks under the stern (inboard of the factory bunks). We also lowered all bunks 2-1/2" using the adjustable brackets; I'm not sure why our trailer was set up to hold the boat so high but it was fairly easy to lower and the boat seems more secure with a lower center of gravity while going going down the road.
We have pulled this trailer (loaded with the boat) for over 3000 miles at highway speeds and have had no problems but, if we were choosing a trailer from LOAD RITE we would consider the 8400# MODEL #LR-AB26T8400102LTB2. Our 6700# model is likely at the load limit when fully loaded for a trip (likely overweight when fully fueled and watered).
Another piece of advice: Torque your torsion-axle-to-frame attachment bolts/nuts regularly. Early on, we noticed that the axles seemed not to be aligned with each other; after we measured, we discovered the rear axle moved back and starboard due to loosing attachment bolts. After re-aligning and torquing, we do check the torque setting before long trips and are often surprised to discover that they do loosen regularly. Perhaps, some manufacturers weld the torsion system to the frame but in LOAD RITE's system they are bolted...something to consider.
We can't speak to the corrosion resistance of this trailer. Our's remains corrosion free; we're strictly freshwater sailors.