Hi guys, I have some Cooper Zeon LTZ 255/55/R19's on my LR4 and am wondering about deflating them for off-roading on rocks and sand. Does anyone have any experience deflating these tires? If so, what pressure would you recommend going down to and do they handle deflating OK? Also, does anyone have any recommendations for a pump for re-inflating? Ideally I would like something that can be powered from a 12V port, is relatively small, but isn't likely to break on me. I've seen quite a few cheap ones that seem not to be so reliable. Thanks in advance!