...if visiting family they offer you a comfortable bed in an air conditioned house and you politely decline and go sleep in the RV outside without AC (low fuel and their 15A breakers keep tripping if you turn it on) in the Texas summer because the house is just so wrong.
...if you are offered a house with no upkeep or payments or other people and turn it down because you'd rather stay in your RV in the winter in Colorado.
You're definitely a fulltimer if both of the above situations make perfect sense to you.
You watch the "Christmas Vacation" scene when Cousin Eddy is dumping his holding tanks into the sewage and you think to yourself, "That stuff is coming out of there pretty fast. He HAS to have a macerator pump!" It gets me every time.
2006 Hornet 28BHDS-Bunk House, Dual Slides
2006 Dodge Ram 2500 HD
5.7L Hemi, Factory Towing Package
Reese Brake Controller, WD Hitch and Sway Bar
You live in the upper Midwest, your DW starts talking about going 3 hours down the road to spend Christmas at her brother's farmhouse, and you start thinking "If there's not too much snow on the ground, we can tow the TT and park it in the backyard..." And somehow that sounds perfectly logical rather than sleeping in a warm house with functional plumbing.
Note, that was one thought I never even bothered voicing!
You tell your wife that you read thru 90+ pages of gadgets, gizmos, etc on RV.net and got some great ideas for the trailer, and she gives you the roll of her eyes and a "Oh, no" expression!