Another more efficient option would be a ductless or portable heat pump but they are a little more expensive.  

Has anyone used the portable self storage units rather than building a building on a cement pad. 

(decon units, showers, portable bathroom, endless reports to write, etc.)The key is to treat things that cause the most dust or have the most attraction to kids, every time you turn over an apartment.

Do they need a large screen or is portability more critical?

Boston, DC, San Francisco, Los Angeles, San Diego, and areas of Chicago are all densely populated and high cost areas, where many residents have white collar jobs that were relatively portable during the pandemic.

Have a phone/camera, laptop and portable printer.

You can buy a portable AC unit the tenant could limp by on… they are around $300-400 at Home Depot.  

Googleman trying to thaw pipes sparks marion twp. fireThat is an example of somebody leaving a dryer running unattended burning their house down. a much better and much safer option is a portable fan blowing air into the cabinet. if the air around the pipe is above freezing the pipe cannot freeze.

The kids that did take it ordered a small portable dishwasher to hook up. 

The properties will be under various stages of construction, will have electricity on, but will not have traditional internet access.I am looking for something where I could possibly either use a portable wifi hotspot or 3G streaming to a cloud-based DVR type setup that I could access any time using the internet, and would have large enough storage to hold (at least) a week's worth of video, and would have night vision and motion sensing technology, and support multiple cameras for different sides of the house.From the research I've done so far, it seems like most wireless cameras like this require a static IP address (i.e. a portable hotspot would not work).