In relatively isolated incidents that have high numbers of dead you can use cold storage to secure bodies, something like a temp controlled trailer is what I have recommended to some agencies during consult work. This will allow for ease of movement, eventual identification, autopsy if required, and the container can be destroyed or cleaned.

For long term, make a reasonable effort to track them and bury them or burn them. In the case of potential crime and eventual investigation burying them would obviously help should they ever need to be recovered but without preservation the time line is going to be rather short.

As for the vicks, I have heard this for years and it seems to be widely believed. However, consider for a second the intended effect of vicks. It is intended to open your sinuses and I find that it actually makes the funk stick with you longer. Throw a mask on and get the work done.