If term with time left you can ask the tenant to sign a new lease or give notice of changes (proper according to your state) but you can't just demand they sign it or change things on a whim.  

Look up why the mRNA vaccine never passed animal trials in the first place.

Is there any demand for new trailer sites in the area?

It’s a different animal than a single family.

Therefore, generically if less than 1/3 of the units were rentals, I'd consider that good as the demand likely exceeds the supply. 

This should help demand just in time for season:https://www.axios.com/fully-va... 

Moreover is the fact that there is a lot of demand for short-term rentals and very low restrictions.

Then send a good handyman through the unit to develop your own list...I'd bet there are plenty of unnecessary items on her list....Look at the existing lease and see what your responsibilities are, then draw up your own contract with them.Frankly I would be turned off if a tenant came up with a list of 'demands' to a new owner....

Great appreciation, cash flow, and increasing rents in neighborhood due to location and demand Lessons learned?

If crypto went to zero tomorrow, there would be thousands of people demanding action (bail out, hand out or demanding blood).