Oh yes, a van in winter would not be my idea of fun. :O
I have a friend who spends much of her time in her RV, travelling up and down the NI, having fun, making friends. I like the idea of it, but I don't think I could do all that driving; although the pay-off is obviously seeing much more of the wonderful countryside. :)
We have a new caravan with a nice heating system and double glass, it is pretty comfortable in winter. Nice to see how many Kiwi's travel around in their RV vehicles. It takes more than a lifetime to explore the whole country.