G'day Trevor and Adele.
If you're thinking of camping in the colder weather in Europe, you'll need a van which is well insulated. Hi-top panel vans as per Apollo in Oz won't do the job. Not enough gas storage and not usually insulated enough. A van with double floor has good storage for skis etc and is usually heated in the interfloor space, quite often with an Alde or Webasto diesel heating system. Coach built is the way to go.
Hymer , Burstner are well insulated and have good payloads. Rapido tend to have a poor payload. Make sure you get an engine which is a turbo-diesel. Older diesels, non-turbo, tend to struggle on long hills.
Also depends on whether you want a RH or LH drive. Although it's my own opinion, if you're planning on visiting Britain, I prefer RH drive. It's easier in Britain and and the continent. Others prefer LH drive for Europe if the majority of time is spent there.
Others will hopefully give you additional info on brands and their own experience.
HTH