Good condition 2 or 3 piece split rims are not a problem, if the person servicing them knows what he's doing. The big rig rims that snap together in the middle are the dangerous ones, or badly rusted, bent, or otherwise damaged rims that can no longer be assembled and inflated safely. Millions of multpiece rims have run billions of miles without decapitating everyone in a 100-yard radius of the trucks they've been mounted on, so they're just not as dangerous as some of the guys with lace on their panties around here seem to believe. Yes, there's a learning curve to doing it right, with deadly consequences for doing it wrong- - - -just like learning to drive.
Jerry