I have never had Winter Wheels, but I would have thought security would be the major concern as new wheels and tyres can be an expensive item. Personally I would keep them separate to the van, as this would make it harder to steal the van. Hopefully someone else will give a better answer.
Elnagh Clipper 90.......... Real Names Mike & Hazel
IMHO it's a complete waste of time and money if you use your caravan during the season, the lay over period from October to April is not going to cause damage to the tyres, if you are worried then move the caravan 12 inches in January. Remember you should replace the tyres after 5yrs regardless of wear even if you have used winter wheels. As I said it's just my opinion based on over 30 yrs experience of owning a caravan.
Don't really see the point of winter wheels, personally! This year we are using the caravan right through the winter, but in previous years when we haven't used it through the winter I have jacked the van up and put stands under the axle to reduce the weight on the tyres to reduce any chance of them developing flat-spots (although I think this was more of a problem back in the days of crossply tyres rather than the modern radial). I do cover the wheels with a couple of old sacks when the van is not being used, but again I don't think it is particularly necessary with modern tyre technoligy (just a case of force of habit!).
Alan (the kiaman) & Sylvia - recycled teenagers (i.e. over 60!) 2013 Bailey S2 Unicorn Cadiz & 04 Kia Sorento CRDi XS Auto with Griffin Tuning Powerbox (175bhp)