The Sailun S637 tire is a versatile regional all-position tire for commercial trucks and special trailer applications. It features five extra-wide ribs for exceptional stability. An extra-wide solid shoulder resists damage caused by high-scrub applications, while a mirrored tread design ensures even wear. Wide grooves are designed for hydroplaning resistance, while a long-life rubber compound is engineered for extended tread life.
I plan to continue to buys these as the tire of choice for my fifth wheel camper.
I haven't put a lot of miles on these tires yet but I can tell you this there is no comparison between the sailuns and the gladiators that came on my trailer. When you push down on the center of the gladiators they cave in when you push down on the center of the sailuns there is no give. If you are looking for a heavy duty trailer tire buy the sailuns.
Have less than 1,000 miles on the new tires. I hauled my 36'-foot, 15,000+ pound 5th-wheel from Richmond, VA to Tampa, FL - these new tires rode smooth - no problems. Checked other reviews on these Sailun S637 tires - most all were positive. The price for these tires at tires-easy.com was about 1/3 the cost of the Michelins that were on the 5th wheel when I bought it. I was in VA for work - tires were delivered to my hotel in a couple days - got them installed locally no problem. I would definitely use tires-easy.com again.
Only one trip on them about 300 miles but they were great. Checked them with an infared thermometer and they were at about 108 degrees at 80 miles. My fiver is a tandem axle 40 footer and 15k loaded. Seems like a great tire for a reasonable price!