Everyone that is buying a spare, here's my top tip...
My father and brother are in the tyre trade and this draws on their experience and common sense...
1 - Don't buy a brand new wheel, look for people that have bought alloys and buy a steel wheel second hand, save loads.
2 - BUT, if your van has alloy wheels, to use a steel spare you may need different wheelnuts - CHECK
3 - BIG SAVING - Don't buy a motorhome specific tyre for your spare wheel, buy a genuine 8 or 10 ply commercial van tyre that is load rated the same as your existing tyres, and buy one of the "cheaper" tyres. My brand new spare tyre cost me £50 fitted, my new unused seconhand steel wheel cost me £20.
The only difference between "normal" van tyres and camper specific tyres is to compensate for the van being parked up for weeks at a time.... So you put your spare on, then fix or replace your puncture when and where you can at a price you're happy with...