Moose are technically deer (taxonomic family Cervidae, which also contains reindeer, red deer, roe deer, etc). And a big bull can weigh almost a (US conventional) ton. I don't know whether that's enough to trash a modern semi (based on an old memory of an apparently undamaged semi and a dead moose on the shoulder of an Ontario highway in the 1990s, I'd guess probably not, or at least not always), but I wouldn't want to be the driver of the semi, either. Hitting them in an ordinary passenger vehicle—like any Tesla product—is something you really don't want to do.