Why trailers almost always have auto inflate on tires, but trucks almost never do?

I've only had 2 Tire Blowouts in 20 years and they were Recaps.
Used to Run Steers & Drives, 100-105. Trailers 95-100.
NEVER HAD ANY PROBLEMS.
Truck Tire Manufacturer (forgot their name) in Southern California stated "Tires at 20% low (from sidewall max pressure) are FLAT"!
I've aired up a few Trailer Tires from 45 p.s.i. to 95 and yes they could have exploded.
It WAS a "lot more fun" airing up Tires in 35-45 degrees with a nice Arctic style "breeze"!
CHEERS!!

 

Before 2010 tire inflation on trailers were rare.. i hope very soon we will see more trucks with tire automatic inflation

 

It’s a nice idea but TRAIN drivers on it . I’ve never pulled a trailer with it but I know what that white light up front means . You tell drivers and they say it’s ok it will go out after awhile geez.

 

They are correct. After the low tire in inflated the light goes out and everything is fine. What’s the issue?

 

yup... the only time I worry about that light is if it stays on for more than about 10ish min, or if it comes on when I'm driving..

 

I see them going down the road like that I can understand parked but driving system shouldn’t need to add air steady unless something is wrong or flat.

 

Probably a slow leak. That’s the best part about the systems. When you run something small over you can keep going until you can get it fixed. With out the system the tire will lose air until it’s caught in an inspection or blows due to underinflation.

 

This is why we do a pre start at the beginning of the day however that usually does involve checking the trailer tyres also.

 

Yup.....that's what you're supposed to do.