x2, my trip to Moab was on brand new wheels and tires. When I got back, had slow air leaks in 3 of 4 tires? WTF?!!!! Turns out sand had gotten in there, was enough damage to score the seating surface of the tire, and they had leaks forever after. Not bad, had to put air in every month. Those tires went with the truck we traded in
X3, after my trip to Mobile Swamp and running about 10psi all day, I had leaks in my front 2 tires, one of them was from a tree branch getting wedged in between the rim/tire and allowing crap in there and the other I figured was from the sand/dirt/mud.