After 5 or 6 mostly unsuccessful attempts, I am proud to declare that we just had our FIRST SUCCESSFUL CAMPING NIGHT WITH KIDS EVER. Only took us 2.5 years.
We went up to one of our favorite spots on Guanella Pass Road, right next to the river. We were late enough that it was super quiet. Clara went straight to sleep in the tent with no coercion. Andrew had to take about 45 minutes to root around in the tent and explore every corner.