The wild camp is at the start of the Stella proper, it's very busy so I can't see any problem with security. I stayed at Bokki campsite (10/15 mins from the start of the trail) so I can't comment on the facilities at the wild camp, but I didn't see anything obvious when I stopped there for 20 mins to have a look at all the bikes. I liked Bokki, although the pitches left a lot to be desired, the bar/rest was GVFM, the facilities were good and it had a nice atmosphere.
The run itself doesn't take long from the camp - an hour or so.
We did the run on Saturday morning as it gets very busy on the Sunday, we then had lunch in town, a chill in the afternoon and tackled Mount Jafferau at 5pm (which is when the trail officially opens). I would highly recommend it - it's a great trail.
There is another trail about 20 mins ride away: it's a very easy one but long and very scenic. Unfortunately I can't remember the exact name but it starts at Moretta. We went to do it on the Sunday but it was closed due to a car rally

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If I went again I would do the Moretta trail on Friday, Stella Sat morning and Jaff Sat afternoon - just my choice.
There are always a bunch of folks on ABR forum who go. we were lucky enough to hook up with a couple of guys who'd been before and they showed us the trails - definitely worth a post.
Our journey down was:
Motorway to Champagne (approx 3 hours) then cross country to Langres - here you have a choice of campsites, one in the heart of the medieval walled town (road noise at night) or head to the lake 5 mins out of town and a beautiful setting.
Next day undulating countryside to the Jura mountains and right through the middle - fast sweeping empty roads. Head for Val D'Isere and camp on route.
Next day Col de L'Iseran, Col Galibier and Bardonnechia.
Hope this helps - enjoy it, I did
