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The safest way to add air to a tire on a "Split Ring" wheel, is from the back side of the wheel (opposite the ring) or, off the truck, in a cage. Dual's are ok as, the rings face each other.
If you change tires, make sure you inspect the groove and ring and know what your looking for. Clean the groove out and leave no rust in it. Clean the ring the same way and make sure it's not bent or has lost it stiffness.
They are still pretty safe done that way but, only fill them from the back, mounted on a axle or in a cage. Most tire shops won't work on them any more.
The worst thing is, if you loose a ring, while driving. My family was in dump trucking and my step father lost a ring, fully loaded. It didn't do to much to his truck but, it totaled the car it hit.