If you have to get dressed in the MH for a week after returning from a trip because unpacking means the trip is really, truly, actually over ...
If you have a crick in your neck for that same week because you can't bear to bring your favorite pillows back in from the MH (okay, okay! I'll go get them NOW!) (Where's that ibuprophen?)
When you need a DVD you have to go get it from the MH
When the dog pouts at home because "you never take me for walks anymore!"
When earthlings (non-RVers) you meet on the road are surprised when you refer to your rig as "home."
When you buy the next RV before selling the last, and realize you now have an RV "fleet"
And ... (drum roll) when you look up one day and realize half your wardrobe was bought on the road at Wal-Mart!