I would expect you could find work pretty much anywhere as a Mobile Mechanic. Just setup Craigs Lists ads or the equivalent where ever you travel. When you move on, take the ads down.
If your wife is looking to work as well, with her management and finance background she should consider being a
virtual assistant. She can pick and choose clients and work on her time. Have her look at sites like
Elance.com for freelance jobs. People post projects they need completed and she can offer bids and get hired.
I am a web site developer. I can work where ever as long as I have my laptop with me. Most of the time I don't even need internet access, although it is nice to have. With the exception of my largest clients, most of my clients have no idea whether I'm at home or 1000 miles away. I have many clients that I have never met.
Although we do not full time, we do home school our kids (12 & 14) and travel a good bit between conferences, home school field trips, classes & co-ops, etc. We also camp seasonally for the summer. With all those trips combined, we spend anywhere from 5 to 6 months away from home.
-Michael