Depends on where you think you are heading off to.
Winter tyres for me are essential for I do a lot of off road camping in fairly wild places in winter. Unless you anticipate getting stuck in deep snow drifts and driving consistently in temperatures below 7c then there are alternatives.
If you are heading for countries that insist on snow rated tyres (Snow symbol on the firewall), i.e. Most of Scandinavia between October and May, parts of Alpine France, Germany, Austria etc, then you may want to consider All season, Goodyear vectors, Michelin Cross-climate etc. There is often a lot of talk about being jack of all trades - Master of none but I have quite happily run my camper on 4 season winter and summer and to be honest the all season performance - wet in summer and wet and ice in winter is marginal compared to specialist summer and winter tyres.
All season are also excellent in dragging you out of mud, an important consideration any time of year.About three years ago when we had the winter of storms in quite mild spring weather in Devon I went mud-plugging, unintentionally, and found my Goodyear vectors performed admirably.
I am not technical enough to comment on wheel size though. Tyres might be all right but you may struggle if you need chains on a larger wheel.
Product rivalry aside there have been many threads on tyres in the Cali forum and currently we have an ongoing one regarding winters.