Somw winters here (since 2005) we used the RV 4-6 times since first winterizing (usually last time out in September or early October) and before dewinterizing for the summer (late April or first time out in May).
I don't think I've ever taken it out to use winterized, as the occasions for going out have been either a warn spell in winter, or to travel to someplace warmer. That means dewinterizing before I go, or after I get to somewhere warm enough.
I don't see winterizing as a season finality, I think on my most active winter I dewinterized/rewinterized five times between first winteriztion in fall and last dewinteriztion in spring. each cycle takes less than an hour an less than $10 in materials using RV/Marine plumbing antifreeze.
My RV, if weather is cold enough to need the plumbing protected, we are not really comfortable living in it. Dewinterized, we can cope with nights in the low 20s F if most of the day is above frezing. At 20 F, our RV is comfortable, but goes through LPG pretty quickly. You experience may vary, depending on construction of your RV. Some cope better with cold weather than do others.
