21 TRD Pro toyo air pressure

I’m a newb when it comes to air pressure. 21 TRD pro with toyo at3. 35x12.5r18. Where should be roughly for daily highway driving? Also, I have a dual axle trailer I tow my atv and few dirt bikes on the highway to the dunes. Should I change the psi when towing?

 

I just got the new Toyo RT Trail in a 295/70/18 and I'm running 36 pounds for daily. They seam good at that PSI. I have a pretty constant load with a shell, RTT, fridge, sliders and skid plates. You can add more for towing if needed, I never do. I tow an Off Grid Trailer as well.

 

This is a useful tool...

 

^ That appears to be a pretty accurate tool. I’ve been using Toyo’s inflation table charts which you can download here:

https://www.toyotires.com/tires-101/tire-load-and-inflation-tables

They appear to jive. Now I don’t have to go download the pdf every time I want to check pressures!