Physiology clarification: carbon monoxide isn't hyper-reactive (you're probably thinking of ozone, "O3"). CO actually binds to hemoglobin (red blood cell protein that makes blood red) almost irreversibly, eliminating the "shelf" where oxygen usually sits, and so you have a patient with normal appearance (red lips, pink toes, fingers, etc.) because the blood appears saturated but isn't actually delivering oxygen anywhere due to the CO binding. That leads to anaerobic metabolism, lactic acid production, and electrolyte disturbances which lead to cardiac arrhythmias and cell death which is how people usually die of CO poisoning.I love the prospect of all of this. I've been working towards an "electric" camping kit and this could make it happen without portable solar or having to lug a separate generator.
However I too am concerned with CO exposure. I'd employ a secondary battery pack to get me through the night before I'd let an internal combustion engine run right by me. I'd run the engine during the day to charge up everything.
The times I've had a generator camping, I keep it well away from the living/sleeping area. I wouldn't trust it right next to my truck even if I was up in a RTT. There's been plenty of examples of people dying in their cars who kept them running to keep the heat on when stuck in the snow. If the outside air is still, the exhaust gases can stick around the vehicle.
CO is nothing to mess with. And for clarification, it's "CO" (carbon monoxide) not "CO2" (carbon dioxide). Carbon dioxide can displace oxygen but is otherwise harmless. Carbon monoxide on the other hand is poisonous. It's an unstable molecule that wants to be stable and so "steals" oxygen. One breathes that in and it literally takes the oxygen right out of your blood and cells. It has a cumulative effect too, can build up over days or weeks (depending on exposure). So while with 1-2 nights of exposure one might be OK, after the next night one might never wake up again.
Honestly if I were Toyota the prospect of camping in/on/around the truck would make me not want to enable the auto-generator function. Sooner or later someone will put a tent right next to a truck and off themselves. In the litigious US I'd be afraid, very afraid.
And carbon dioxide is <0.05% of the air, it doesn't really displace oxygen in any meaningful way. And it's absorbed super quickly in the body, and is converted to bicarbonate and excreted by the kidneys if there is an imbalance.