Advantages to non-conforming legal MH parks? Upsides?

I’m looking at one park and seeing if I can get the Ok to drop in portable self-storage units on a grandfathered MH park. It’s looking positive with the planning department. Is this also possible with the original MH park zoning in most areas or is this an upside to rezones with grandfathered MH park land-use?

Portable self-storage units, in most cities, are not classified as permanent structures, and fall into the same “temporary” use as a shed. When we have checked into putting them in our parks, no city has ever said that it was not allowed. Of course, that may also be because the assumption is that they will be used predominantly by mobile home park tenants, so they see it as an amenity as opposed to a new business.