I am aware of the requirements and follow them. For Pigs outlines maximum loading recommendations depending on vehicle type and temperature. It does Some animals need to be transferred separately from others, for example mature boars, injured animals etc. If these animals are not separated, they may be unduly harmed or harm others. I bed with straw and provide protective wooden liners against metal siding.
Pigs have very little natural protection from the cold.
They stuff frostbite very quickly and can also be killed by wind chill. Necessary precautions to take for cold weather transport include providing bedding and liners. I do not change stocking densities in hot weather. Pigs have a very low tolerance to high temperatures and humidity. Precautions reducing the possibility of heat stress include decreasing stocking densities, providing none or very limited bedding, ensuring maximum airflow through the vehicle, loading and unloading promptly and limiting any slops.