Two weeks ago I put together my HEMTT wheels and 46" tires, new gaskets, new air valves, and I put air in them and the pressure stayed. I went out today and all 7 of them were at 0 pressure and not on the truck yet. So how often do you have to fill these things? Or what could have possibly gone wrong in putting them together? The two sides of the wheel touch the bolts as far as they will go, the gasket set in the lip..... I'm at a loss. Any help would be greatly appreciated, thanks.