[ianleighton]

Temporary in that they are moved 2-4 times a year, but permanent in that they are used throughout the year, just in different locations.

[marcinzm]

Sure but moving means you do a total inspection and replace anything that is wrong 2-4 times per year. You can also clean off any mildew, water damage, plug any holes, deal with any ground issues underneath, leave behind any biological waste, etc.