Fairly long season there, main lifts run till end of October, ie up from Les Chables and the Medran. This serves a decent portion of Enduro and Bike Park (less top two shortish easy red runs). Also Savoleyre lift only runs July and Aug. Never really seen any Camper Vans and anyway staying down the hill is good for biking as enduro trails finish in the valley. Other thing I would say is bike park is relatively tough with 1 blue and main reds are quite tricky.
I love it there, 2016 is first year in a while I didn’t go there for at least a long w/end. Bike Verbier if you want to make the most of the area, guides and uplifts and lots of riding away from main Verbier bowl. Relatively pricey but includes food etc.