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

I have actually seen drivers let air out of tires at end of day after driving all day.
Mind blowing it does no good to try to explain to them when tires cool down they will be under inflated. Get the blank stare of I don’t comprehend. like explaining calculus to a 3rd grader

 

I'll stick with my TPMS....

Shows temp and psi of every tire... yes all 18 in real time.

Alarms for over temp. Over psi, under psi, slow leak, fast leak...

 

Maybe it was OVER inflated?
One of a shop guys install my steer tire at 110 when it was 60 degrees outside, in the end of a shift I ended up with 125 psi...on a front , way more then I should have.

 

No. That is exactly what you should have! Tire pressures are designed to be at proper inflation when cold. A 12-15 psi increase in a hot tire is completely normal. Tires are designed to handle that pressure increase. NEVER let air out of a hot tire.......ever!

 

So

So scenario when your hot overinflated tire will blow out never happens, right?
I prefer to keep my steer at 110 , or yeah in a morning it might will drop to 95-97 so what?
It's 1 hour of driving with underinflated tire vs 9 hours of driving with overinflated tire

 

You do what you want to do. Every tire expert and manufacturer will tell you it is wrong. You obviously know better.

 

Low tires blow first .pressure on sidewall is minimum for weights allowed

 

May I ask what system you have

 

Look at weight and psi chart for each tire mfg.

 

No such thing as an over inflated tire when cold.
It takes somewhere in the neighborhood of 400 psi to blow a truck tire. Actually the rim will give out first.
Tires blow because they get weakened from too much heat from flexing caused by being under inflated.