Dirt, SARS-CoV-2 attacks many vital organs and causes organ failure so those with pre-existing heart or lung conditions, for example, have organ failures that cause death. What is the efficient cause of death in those cases? A heart attack, pulmonary congestion, or the effects of SARS-CoV-2. In some states, the data is being distorted and they are listing the pre-existing condition as the cause, while in others SARS-CoV-2 is listed. As for your car crash example, I don't know where you got it, but you ought to check your sources. They don't sound very reliable.
Selecting a travel trailer that fits the needs and desires of a family is a particularly personal choice, but there are a few basic concepts, apart from working systems, that generally apply. A trailer should have adequate sleeping space for all the occupants. It should have adequate storage space. It should have enough volume so that the occupants can move around without climbing over one another. And, if it is for a family with kids, one needs to anticipate the needed space when the kids get big, which they do really fast.