I put Sailuns on the Monty 353RL. Maybe to clear up some confusion. I could only find 236-85/16's in the S637 here in the states. I did find info on the 235-80/16's but only available in Canada. The weight different of the Sailuns compared to the Trailer Kings was surprising - much heavier. Per this chart the 85 series is .9 inches bigger in diameter or the trailer would stand less than 1/2" higher. So far I like em!
