See this chart prepared by the IRS to learn more about the portability of various retirement accounts. 

Upon some reading, it look like it might be able to be depreciated in 7 years IF I make it a 'portable building' (think glorified yard shed)?

As the WSJ review said it is really a portable computer.My sense if you can use the web browsing capabilities to check maps, look up rental information if you use an online PM system and otherwise have info with you at all times (or access to the web with full web capability).Plus the ability to manage your email so you could check in with people handling a closing, etc if they need to send documents for review.Some other phones are pretty close or have the same ability for the activities above.Comments?

Just a thought for you Doomsday Guys:If it really goes down, the things of value you are stockpiling had better be portable.

What do you usually factor in for portable toilets, temporary power, temporary water, and other holding costs?  

Dodd-Frank may be applicable selling to a consumer, if it's portable it can fall under the mobile home guidelines.And yes, if its a residence TREC applies. 

Where/How do i find the best portable storage containers? 

I recommend a portable unit.

Hence you may spend a lot less to have a system that works given there is less software to buy after the basic hardware.I am typing this on a Mac Portable.

The problem, though, is that land is not portable and hanging on to it if the wheels come off the bus could turn problematic.