Possibly Mankind on the run (1956) by Gordon R. Dickson. I haven't read it and don't have a copy handy to check, but the title seemed promising, and this quote from someone at the Goodreads site is intriguing:

A hypothetical future where the world's problems have been solved by setting humans into castes and where no one gets to stay in one place for more than six months.

Possibly Mankind on the run (1956) by Gordon R. Dickson. I haven't read it and don't have a copy handy to check, but the title seemed promising, and this quote from someone at the Goodreads site is intriguing:

A hypothetical future where the world's problems have been solved by setting humans into castes and where no one gets to stay in one place for more than six months.

Possibly MANKIND ON THE RUN by Gordon R. Dickson. I haven't read it and don't have a copy handy to check, but the title seemed promising, and this quote from someone at the Goodreads site is intriguing:

"A hypothetical future where the world's problems have been solved by setting humans into castes and where no one gets to stay in one place for more than six months."

http://www.isfdb.org/cgi-bin/title.cgi?3759

Possibly Mankind on the run (1956) by Gordon R. Dickson. I haven't read it and don't have a copy handy to check, but the title seemed promising, and this quote from someone at the Goodreads site is intriguing:

A hypothetical future where the world's problems have been solved by setting humans into castes and where no one gets to stay in one place for more than six months.