Usually I go down to 25 for offroading. I may go down more to 20 in the future now that I have 35 12ply.
I also have an ARB single onboard air, using Moorflate kit to air up and down.
MORRFlate Quad (4Tire, Up to 125" Wheelbase) • MORRFlate by My Off Road Radio
I use the quad kit from my 4Runner, but it's a bit snug to use on the RAM. I'd go Quad+ or even Mega Quad if I have to buy a new one. (Mega Quad because bigger is always better)
Benefit of using this:
- Airing up and down all 4 tires at the same time. To air down, I connect the hose kit to all 4 tires and open the valve to dump air. I then check the tire pressure using the attached gauge periodically.
- This is better than those automatic self-deflate devices as there's no presetting required. With the auto self-deflate devices you will need to calibrate all 4 of them before use, and they are not always accurate.
- Air up is the same, just connect a leader hose to the valve and repeat the process
- This also shortens the time and effort needed compared to airing up each tire individually and ensures equal pressure. For our trucks, if you prefer to follow the OE tire pressure requirement (55F and 45R) you can just disconnect the chucks for rear tires once pressure is achieved.
For driving, when going up the dune, do NOT lose momentum. Or else you'll end up like this:
And the worst part was i was actually sliding down too