Lol exalt you really don't have a clue do you?? I have first hand experience of ammonia freezer plants and know the issues you can have with even the smallest ammonia leak, yes petrol and diesel fumes can be harmful but ammonia isn't just harmful it's deadly, why do you think companies in the U.K. that have ammonia on site have to have a separate alarm system to warn of a leak?? Why do you think the fire brigade after a leak won't let anybody back onsite until an expert has proclaimed the area safe?? Because ammonia can and will kill that's why with petrol your more likely to be killed by a fire not the fumes.
As I said most freezer chiller suppliers are now moving away from ammonia to co2 because it's a safer system.
By the way exalt where is this super truck it's well into April yet and we've not seen a thing of it