Why not to use portable heater while driving

we use our blue flame while we're driving, but the husband put long boards on the bottom so it doesn't tip. Only problem I can see if we're in an accident, I bet it might still tip if violent enough of a crash. I won't turn it on again while driving after seeing this!


Our class A is FREEEZING while we drive. Might have to look into a curtain right behind the driving area.