Forum Discussion
JIMNLIN
Feb 28, 2019Explorer III
BZawlocki wrote:
I've had long e-mail conversations with both Alan and others at TBC Brands (the US distributor for Sailun). I am very confident they will tell you the same thing they told me:
1. The Sailun S637 tire is often sold to commerical truckers who will almost always inflate the tire to 110psi. And they do this for one simple reason - they just do not want to take the time to adjust PSI for each load. So most commerical users inflate to 110psi.
As a former commercial operator pulling heavy GN flatdeck trailers there are several reasons we use max pressures regardless of the loads. Through millions of miles we learned the hard way max pressure makes for a longer lasting cooler operating tire.
The biggest plus is something they teach in trucking schooling/classes and fleet mgrs harp on is derated tire pressures can affect the tow vehicle fuel usage. This affects bottom line which is less fuel used = bigger paychecks all around.
In this type of work we use lots of tires. I had five trailers on the road with 28 tires on the ground. Just about all those trailers may use two sets a year at 40k-60k miles per set. So we learn quick the folly of derating a tires pressure especially on a trailer.
Some rv folks like to use minimum pressure charts which may work for them which is fine ...but they also don't wear out tires....they mostly time out or come apart.
Like Goodyear tells us;
Goodyear Tire and Rubber .... weighing RVs
Special Considerations
***Unless trying to resolve poor ride quality problems with an RV trailer, it is recommended that trailer tires be inflated to the pressure indicated on the sidewall of the tire. Trailer tires experience significant lateral (side-to-side) loads due to vehicle sway from uneven roads or passing vehicles. Using the inflation pressure engraved on the sidewall will provide optimum load carrying capacity and minimize heat build-up***
About Fifth Wheel Group
19,031 PostsLatest Activity: Dec 16, 2025