Think about your ancestor's career or occupation. How portable was it? A landowning ancestor who farmed might have moved, but it likely wasn't every two years and moving took a little bit of time and planning. If your ancestor had a small business, he might not have moved around too much, especially after he got himself established.
However, if you ancestor had a skilled trade, he might have been able to move more quickly, assuming he could find work.
And your day laborer ancestor (like a few of mine), might have moved all the time.
Think about your ancestor's job, career, or employment and how easily it might have been for him to be portable.