[Air down- When?, how much?]

Air down, When and how much?

Thank you all for your input on this topic. So I just purchased a set of BF Goodrich AT KM2 for my Landrover Defender 110. Drove from Lima to Huaraz, Peru all tarmac. They are currently set at 35PSI. So my next question is : Should I be running les than 35PSI even if I am on tarmac? It appears that it really is subjective as to to how much air one wants to use. 

I was impressed by the way they handled on tarmac. These tires were recommended by some of the responders to my topic "Steep downhill, clay,mud

[Air down- When?, how much?]

What is the recommended tire pressure to air down when going off road?  Should I air down every time I go off paved road surface?

 

[Driving down steep wet clay mountain roads]

I liven the Andes Mountains of Peru and we have two seasons, wet and dry. It is necessary that I travel up and down some some very hazardous roads. 

The roads are very steep and narrow. There are various types of soil that when when turns into a very soapy, greasy  form. I have had times when I had to let the off of the brake completely and pray for safe landing. I now drive a Landrover Defender 110 but have had a Landcruiser and gotten into trouble. Some of the problem was due to BFG tires filling up and not cleaning out turning into slicks. I am looking for a new set of tires for the Landy which currently has Goodyear Durawalls 235/85/R16 as stock tires from Factory. I drive 90% off road on mountain gravel,rock roads which change in rainy season.

I am looking for two recommendations: 1. What tires would be recommend? 2. Recommendations on steep greasy roads down mountainsides?

I have been looking at the BFG Mud Terrain T/A Km2 tire. Any thoughts or suggestions?