Small safe at the Outpost for valuable, but most just secure it in their tent. From what I have seen/heard, there has not been an issue. Use common sense though. Don't leave valuables in the open and visible.
I have heard of some who would even use a "Zip Tie" to hold the "Zippers" together (since many tents have a "Split Zipper")
If you don't have a vehicle to lock larger valuables up, and if you are still concerned, I'd suggest you not bring them. If it were me, and it was something like a laptop, I'd bring mine and just keep it hidden in the tent. Again, most folks will leave well enough alone.