No breakfast. However, when I was young & tolerant I would do this when I went moose hunting. I've slept in the bed of my pickup when it was REALLY cold. The stupid air mattress would deflate because of the cold. Your arm, shoulder would feel the freezing steel of the truck bed thru the deflated air mattress, get cold, start aching. Wake & have to reinflate the mattress.
People ask - why not sleep in the cab. The moisture in your breath freezes on the metal ceiling of the cab. For the first hour or so - after you wake and start the pickup. It thaws and drips down all over the inside of the cab.
Very best solution - army folding cot - right out on the ground - two down sleeping bags. Once you get in and get settled its OK. I never had any kind of tent or camper.
However, every late hunting season I alway got a moose. Sixteen seasons - sixteen moose.
You are looking forward for pictures - - I'm still waiting for a vehicle that is supposedly "in transit". Must be coming from China.
I've irritated the "instant chat" folks on at least half a dozen tonneau sites.
Life was simple back in those days. When I went hunting it was usually 2-3 days. The wife would make me baloney sandwiches and I had apples. Three baloney sandwiches, three apple per day. No cooking or other tasks required. Hunting was not a sport or for pleasure. I was out to get meat.