16-18 psi. I use Staun's to deflate, one was accidentally set about 12 and I didn't have any issues. I would like the power tank but I don't like the $. The $60 compressor from Costco suits me just fine.

I've punctured one tire on a rock while aired down and one while not aired down (basically it was a gravel road) on a bush stump (maybe it was a shrubbery)

 

The only knock on the compressor is the time it takes to fill up one tire. If your off road group all chip in and buy one it really is affordable. That's not what I did and you think the guys that I go off road with would try to give me some moeny for the service that I provide but they don't.
Just Kidding....seriously once you see one in action you'll want one. I filled up four complete trucks by the time a compressor filled one tire.

 

This seems to be the cheapest and works ok too...About 2 min. a tire.Tsunami Master Flow "1050"$59.00 at Pep Boy's. Of course if you don't have the time you will pay more!

[IMG]local://upfiles/2570/25EA3FE542734B0D9DE3BF645726E0A6.jpg[/IMG]

 

Even though it's expensive, I'm begining to think it might be worth it. I've got the Master Flow portable air compressor, but this can be slow and you get a lot of moisture in the tire. Especially here in the Midwest or the South where it's really humid. The moisture really plays tricks with the TPMS.

 

The problem with running tires pressure below about 16psi is that your risk of popping a bead goes way up unless you have beadlocks. You can run the lower pressures but I have seen a lot of people drive out of their tires.

 

18psi on the trail is safe. Anything below that IMO, you risk blowing that bead. Sand, I'm not sure on yet.

I'm also running a 35" tire. There is more sidewall to flex that the stock 33's. So again, it really depends on the tire and terrain you will be running.

The stock 33's I'd stay around the 16 to 18 psi as well.

That power Tank is the only way to go. I have had one for three years. The only issue I have had is that everyone you wheel with will wnat to use it!!!![:@]

The other thing to metion about the power tanks: MAKE SURE YOU ANCHOR THEM DOWN THE PROPER WAY!!!! If that tank comes loose in a rollover or serious change in side slope. Your goign to break interior pannels, dmage cargo, or worse yet hurt someone. MOUNT THE TANK!!!!

 

I agree Timgco

 

18-20 works for me !

 

All good advise!!!! Thanks

 

I run 5-8 PSI on the beach in my K5 with 33 12.50 15s. I havn't had the H3 in sand yet.

I still stand by the 25% rule, it works on any vehicle with any tire and wheel setup.

The powertank is insainly over priced. You can put your own together for less than half the price. You can even scale it down and usetanks for paintball guns which are cheep and easy to store.