last line is a sort of false statement. I work on Semi trailers as a living now and every week i get one that has damage from cars hitting them. Most Trailers now are aluminum and it doesn't take much to bend one up and its a pain in my ass to fix. As far as semi's being made to hit animals probably small little critters but even a Raccoon will do a lot of damage especially the semi's now that have the super wide rear axle tires. It doesn't take much to bend them and they are also aluminum. I will admit that the trailer and truck are made tough but at highway speeds its just like driving a normal car just a lot heavier.
And cutting off semi's is a really dumb idea. Even if he has no load hes still pulling about 10 tons easily depending on the type of trailer behind it.