I've camped while riding, I love it. The worst was in Alturas, CA. It was warm when I went to sleep, but I awoke at 3am with my bag covered in ice. Condensation from my breath frosted in the tent and I was freaking cold. Luckily I was at an RV park so I crawled into the laundry building and slept by a small heater.
The next day I made it to a WalMart in Bend, OR and bought a $7 heater. That night I set up tent at another RV site with a hook ups. Plugged the heater in and slept very comfortably in a tee shirt.
On the Columbia in WA.