Cooking in the cab

I think you’ll find that most of the suffocation cases are from using a stove for heating, rather than cooking. There is a danger to using an open flame gas stove in a confined space, as mentioned by the OP, fire being the obvious one, but there have been a fair number of explosions too, some of which have been quite spectacular, blowing not just the windows, but the roof and doors out of cabs and sadly killing anyone inside the cab.

That always worried me, a gas bottle with a slow leak overnight and a big bang when I sparked up my breakfast B&H the next morning, that was one of the reasons my gas bottle never lived in the cab with me, the other reason was seeing the scar on the forehead of an old mate, sadly no longer with us, that had rolled his F89 and was amazed to find he had survived unscathed, until his gas bottle fell from the top bunk and knocked him out cold when it landed on his head.