Geez, you part-gumby guys must be the ones stealing all the spares around here. I can't imaging airing the spare valve up without dropping it. Tried to hook my spare valve side down and it didnt want to fit in the lug openings. You guys have hitches and regular size tires?
Sometimes salt corrosion causes air to leak slowly out of the beaded areas. I'd suggest having the tire taken off and remounted with some sealant. You're local qualified tire center should be able to do that for you.
I use one of these things. Fills both ways so you don't have to drop the tire.
Pull vs push as it were.
You can do it from underneath without lowering the tire.
But then I have a lift too that makes it easier :bluejump: