On John Deere tractors which are notorious for air leaks, a thin coat of silicone sealer around where the bead goes will take care of it. The front tires are the worst for leaking, ad alsmost impossible to munt yourself, so if you take it to a tire place, tell them you ant some silicone sealer around the bead area.
They frown on Slime. If they have to change a tire, it is a frickin' mess. Almost any tire guy will ***** about it. Plus it leave the rim grimy, and if there is too much in there, it will leave their machine grimy. They aren't too happy about that.
I hate messing with a tube all for the fact that if the tire gets low, the tube wants to slide inside of the tire, leaving the valve stem on an angle. Then of course if it gets off on too far of an angle and you got to fill the tire, it will pop the tube where the valve stem goes into the tube.