Not really needed, any type of experience is good. You do need some sort of outdoor experience. .
what is "some" ?
The north shore is "the mountains" where it can snow any time of year, people get lost up there in summer and have a very uncomfortable time, but now its fucking cold, there is 140cms in the last week at cypress on a huge base, all in steep and complex terrain so travel in the BC would be tough for an experianced out door person let alone someone without good skills … you need actual BC skiers and climbers
I've seen Voly SAR who simpley lacked the skills or conditioning to get up a mountain
edit: In the national parks Banff/Jasper they have dedicated rangers and staff, fit people with training up the yingyang to deal with SAR and given the SAR traffic on the NS I think the area needs a dedicated SAR … as opposed to charging money or leaving them out there till spring