La plagne with campervan, no reservation

Hello all, I want to join my sister and family
Skiing in march, in La Plagne, in a campervan.

I was supposed to go with them last December, I booked the official campervan parking with electrical hook up which I needed at the time. Anyway that company are absolutely useless and 6 weeks after my booking was confirmed they decided to cancel on me. This is considering I’d already paid my euro tunnel and booked work off, etc.

Now I’m in a different situation, I have self sufficient electricity so don’t particularly need hook up, etc. No way would I use that car park service again anyway.

I will say though I went to sestriere and noticed a lot of vans parked on the side of the road. Overnight camping, etc. Is there places in La Plagne I can do the same, or is it a bit tighter for space?

Thanks

George