You could do it in one. It's an evening or morning shot, probably moonlit (see the dying sunset, or burgeoning sunrise behind the mountains?) Meter for the tents, then meter the mountains every minute or two as the moon rises or sets, until they're in balance with the tents. Say 1-2 stops up. Then pray that the stars fit in. Say around 2 seconds at f/4 and ISO 3200, plus or minus a couple stops either way, depends on the tents. The figure is standing quite still. To my eye the mountains have that slightly strange look of very long exposure for an "almost daylight" look.
I'm betting against strobes. These guys are not exactly in downtown Denver.
EDIT: If you don't think everything will fit in the exposure, go look some stuff up. Poke around on flickr to see what EVs actually work to get stars (hint: there's a HUGE range that will work pretty well, the more you expose, the more stars you get) and what EVs you need to expose by moonlight.