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). 

I am also considering that I could backup all data to the harddrive, then save the data file to a portable flashdrive, and plug the flashdrive in whenever i needed to work from another computer, and just make sure to save all data before ejecting the flashdrive.

You might be capitalizing that portable saw that you probably should consider just taking as an expense anyway. 

In any case, I do have a backup now on my portable drive.I could potentially mimic the #2 item in the scanning and still be able to cross reference that to my spreadsheet and then toss the paper copy.

But do plan to take you portable office and cell phone with you and make sure there's a hot zone to log onto wherever you go.

Ha, beware not only portable collateral, but edible collateral!