Tire pressure for T@B 320 S (2020)

Lauinger

Sidewall says max of 50 psi. Can they run at 44-46 ok?

Denny16

The sticker on the front driver’s side of the TaB, lists the correct tire (tyre) pressure for your trailer.  The tire shows max recommended pressure for a cold tire/tyre.
cheers

Bayliss

@Lauinger, opinions will vary on this, but I keep mine at 50 psi cold.  I have found, in my personal experience, that the tires seem to wear better at the sidewall max.

Generally, I have found that it is recommended to set it at the maximum noted on the tire sidewall for a travel trailer.  You can go lower (between 45-49) for a softer ride.  However, I would not personally recommend it, because you will reduce your cargo carrying ("payload") capacity to a certain extent, plus the tire will probably run hotter than it would if inflated to the max psi stated on the sidewall.

Here's what Goodyear Tire says:

“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 buildup.”

And here's some info from etrailer.com:

https://www.etrailer.com/question-166947.html

MuttonChops

Lauinger said:

Sidewall says max of 50 psi. Can they run at 44-46 ok?

As @Denny16 noted the trailer has a Tire Size Pressure sticker on it that recommends 50 PSI and your tire sidewall has something like Max Load at 50 PSI.  Lots of T@B Owners do run at lower tire air pressure.
The goal being to provide a slightly softer ride {for your stuff in T@B }.

When tire pressure is below 50 PSI then tire load capacity is below its maximum rating.  T@B 320 S axle is rated at 2,900 pounds {Gross Trailer Weight is 2,800 pounds on mine}.  So at 2,900 pounds each tire must carry at least 1,450 pounds . . . and of course for safety one whats the tire to be able to carry more then just half the axle rating.  This table shows how Tire Load Capacity changes with air pressure.

Standard T@B 320S has 205/75R14 tires.  So even at 45 PSI the load capacity is ~200 pounds above the minimum needed.  I generally run 48 PSI . . . as I'm not as comfort with 45 PSI safety margin.

There are several informative articles (by tire experts) on the web covering Tire Load vs. Air Pressure.

Dalehelman

Goodyear Marathon tires. Approximately 15,000 miles even tire wear At 45psi. Higher tire pressure caused center tread wear. Lower pressure caused outer edge tire wear.