I would just use it in combination with Medical assets for other collected Packages. Poser Models are relativ Cheap compared to models that they have at cgtrader or at turbosquid with even better quality so Poser DS users are rather Spoiled. The list you Placed is pretty long so in theory the creator would end up having to set a Price of 100$+ for all the work and then again Poser user would say " No Way I Pay this for a Ambulance " A Detailed equipment for Oxygen can take an artist weeks to Produce. I do not know if you were willing working at that Price . So actually allot of things on how they are Tagged are almost free for What the artist really earns . And there is not allot of respect around in this sector for the efforts a Creator has to make to Please the Spoiled Customers . So Best Choice get your self some stuff from "Davo" as he has allot of great medical Equipment and mix match these with your Vans and Ambulance or Hospital , even good for the Asylums ( But you got to Pay the Price for it )

You try to make just some cylinders and oxygen tubes and masks in plastic then tell us how much efforts and time it took you ending up calculating a reasonable price if you sell it 50 times at 30-50% of gain , the way it actually should be.