Although I also favor a 4 wheel (tandem) trailer, The 22 I have now has a 2 wheel trailer with capacity of 4600 to 5000 lbs. We have towed the boat about 7,000 miles so far this year, with no problems. First you have to have high capacity tires, and rims. Next you have to replace the tires every 4 to 5 years. We check the pressure daily, and do temp checks every two hours on the brakes, tires and hubs.
The single axle trailer is easier to maneuver but with 15" wheels, the boat is higher out of the water.
Some favor a long tongue to avoid getting the truck in the water.
The boats tend to weight about 4000 to 4500 lbs loaded.
The Pacific brand also has a good reputation. But in reality all trailers are variations on the same theme. Some are better built--heavier frames, SS fittings torsion axels, disc (Kodiac) brakes--even some with electric over hydraulic brakes.
Back East most trailers are aluminum (as is mine)--and they are lighter. They also seem to wear as well or better than galvanized.
I favor bunks over rollers--but again there is a choice with arguments on both sides.