Silly question:We are getting ready for a short journey tomorrow afternoon; is it okay to check and fill the air in the trailer tires today; or, should I wait until tomorrow? Does it really matter?

as long as the trailer has been parked for a few hours it won't matter one bit when you check the pressure. Yes, it can vary slightly as ambient temps change, but really not an issue.

It only matters if the temperature is expected to be more than 20F greater or less tomorrow.

you should check your air pressure when the tires are at the current outdoor air temp and not in the sun. If your traveling and do not expect the temps to change much a day before is ok , I check mine the night before when the tires are in the shade and the tire are cool, If you have a TPMS you will see the pressure go up as the tires warm up also the sunny side will have higher pressure than the shady side as you travel. its best to have them cool like the sidewall says xx psi cold

As others have said, it doesn't make much difference in terms of pressure changes unless the temperature is changing wildly overnight.If one (or more) of the tires are quite low, I think it would be a good idea to double-check them before leaving in case there is a slow leak. If they're all relatively close to the correct pressure and all about the same, it's a pretty good guess that none are leaking and that they won't develop a leak sitting parked overnight.

I check mine first thing in the morning before the sun start heating them up the day before I am leaving.

Tire Air-Presure Preparation: timing | Good Sam Community

CapriRacer
Explorer II
Jun 29, 2017
JimK-NY wrote:
..... BTW, did you encounter any data about the age of tires? .....

Yes, but nothing useful for the consumer.

But if this project was about trying to determine when tires should be removed from service due to age, there are a number of problems:

Ambient temperature plays a HUGE!! role in this. Tires in Phoenix behave differently than tires in Minneapolis. Those of us in the tire industry have the data that says that most tire failures occurs in (and in pretty much this order) AZ, CA, TX, NV, and FL.

FL seems the odd man out, but if you compare the temperature profile of FL over the span of a year, it is fairly flat but elevated. The net heat input to the tire is pretty high compared to - say - MN.

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