We have a different take. The reason the owner in most cases is selling the park is because the current Manager is misbehaving. We usually figure out during the due diligence process who our Manager and Maintenance is going to be and hire them.
There was one instance where we let the current manager continue. However, the manager was grossly overpaid and he retired soon after we took over the park. Overpay is another issue we don't hire current managers.
In most cases the previous owners themselves haven't managed well. So you will spend more time unlearning the bad habits of the current manager.
We like to have 2 backups if the hired manager doesn't work out.