Cessna 182, stock sized tires, I ran tire pressure according to the POH 49 front , and 42 psi in the mains.
Some of the strips I go to have mud, others are a bit rough.
Was thinking of lower the air pressure in the mains, recommended or not?

I don't know about a C-182, but in an Ercoupe, C-150, and my current C-172 I run 10 psi less than the book spec for gravel operations. It makes the bumps a bit smoother, but adds a slight but noticeable increase in takeoff distance.

I'm guessing that's a typo when you wrote "42 psi in the mains" and you mean 24 psi?

Edit: I just checked the 182 POH and 42 psi is right. Wow, that is hard! But I guess it's a 6.00x6.

Yes it is hard and they are 6 x 6.00.

I guess 10psi less wont do any harm .

Moto-

You need some tires...seriously...

With all that flying you do and the muddy strips, those 6x6 are an insult to your missions.

I know you are aware of this.

AKT

Yes Im totally aware.

I drop mine way down sometimes, like 25 but I carry a little 12 volt compresser to reinflate. Takeoff roll is ridiculous on asphalt that way, so figure 1.5 times your usual. On my j model, I also found out the hard way how important it is to zip tie the braided steel brake lines to the gear legs. I broke both brake lines once right where they go from braided to solid because of the violent flopping on a rough strip. Almost got to the barbed wire fence on that one.