I am West of Fort Worth. The first winter I drained everything and used compressed air to blow every thing out. Last winter I didn't do anything at all, but it was a very mild winter and we didn't have any of those couple days in a row were it didn't rise above freezing (or dip very far below freezing).
The first winter there were a couple times we wanted to take the trailer out for the weekend but didn't because I was feeling lazy and didn't want to have to worry about getting water back out of the system. Last winter we took the trailer out a time or two we might not have had I drained all the water lines. This winter Ill keep an eye on the weather reports again and if a good cold spell comes Ill get out there and "winterize" it.
All that said I don't think its worth taking a chance just because your lazy (referring to my self not you). Here in Texas we are fortunate enough that we get lots of great weather during the winter that its the perfect time to be out in the trailer. If you are one who decides your not going to go camping at all during the winter months by all means winterize and put the RV to hibernation for two or three months. If you like to get out when temps hit the 70's in January and the weather is good for a week or two between cold spells, be prepared to winterize again. This is why I blow my lines rather than use the "pink stuff"
One more alternative is go camping but don't use the water system.
Robert
2016 Ram 3500 Cummins 4x4 CC Longhorn LB DRW 4.10's Aisin Trans Auto Lvl Suspension Dual 220 Alternators
2014 Ram 2500 Cummins Megacab 4x4 Longhorn (traded in)
2015 CrossRoads Longhorn ReZerve LTZ31SB