If you the area is a C class area, then window units and portable heaters might be perfectly fine.

If you can't develop or hold pressure, you know you've got plumbing issues, but at least you don't have a watery mess to clean up.You can get everything you need at Home Depot including a portable generator and a portable air compressor and all the fittings to connect the air to a water hose bibb, or even a kitchen faucet.

I bought the pdf, so it was a lot cheaper, and more portable.

Get some portable bathrooms, similar to those used at PGA golf tournaments.How many rv s can park on your property overnight without you needing a campground permit???

If you have space, you rent out office space for meeting, have mailbox services, rent land to cell towers, etc.. if you have right of ways or easements that you can't build on, you can place portable units or have parking for boats/RV/vehicles.

Portable loans = When you sell a home, most generally buy a new home.

I broke down last summer and finally got a portable unit after living in Oregon for 11 years without it, mostly because I was worried about my animals when I was at work. 

For instance, if you wanted to email someone a PDF link for a value write-up in a pinch.Also, if you are on a Mac, invest in a portable hard drive.  

My long term tenants are OK with portable heaters that I provided them.  

I intend to buy a house this summer and portably about 1-2 per year for myself and family after that but am open to growing into more deals as a side hustle.