I have recently been involved with the goods inwards side of my works stores as we now inform any of the coureir drivers to refuse to take a wheel that is still inflated to operating px, there are regulations about road transport ,serviceable wheels with fresh rubber can be transported by road and air.We carry 2 serviceable wheels in bulk cargo at operating px but as Edgar said inflated wheels at high px is a big no no not only in europe we made the mistake of loading a worn to limits wheel back into bulk cargo as we had used both serviceable wheels and this wheel was just worn with no canvas showing simply because the next stop was at a station in africa that held no wheels for us a , a simple paper excercise cost the airline a days on the floor while the s aussie caa checked around ,the flying spanner wrote out the wrong labell,a defect one instead of a hold one , once this was explained and the caa watched the wheel being deflated all was good.The bounce thing Iam with Edgar on this one if the wheel is at operating px and just rolled off a tailgate of a truck it will bounce uncontrollably and a 747 wheel assy is 475lbs in weight and will cause some nasty injuries if it lands on you ,there is also the fact that the impact on a defective tyre may make it suddenly explode (check this website out to see what an exploding wheel is capable of
www.alberthaviation.com and look at the videos of testing safety inflation cages )