Could put cargo containers and parking.  

Still park it & be ready bid side until the opportunity comes.

It's thorough, easy to use and easy to modify so you can include your own special terms such as quiet hours, how trash service will be handled, parking, and anything else that is specific to your property. 

Check out the CRREIA group which meets in Clifton Park for meetups.

Find a park a distressed park, find some distressed trailers, put your husband to work. 

(I posted a pay or quit notice on the door of a rental house with a new jet ski parked along side the garage once.

I knew demand was strong for RV and semi truck parking.

In addition to those above-referenced issues related to conversions, the additional unit(s) would require a parking space and enough lot area/gross floor area to meet the requirements in 9-703. 

What about drive approaches, parking lots, site lights, landscape, irrigation, etc.? 

Parking will likely be your biggest hurdle.