Anonymous ID: 0d04dc May 2, 2018, 9:39 p.m. No.1281938 🗄️.is 🔗kun >>2080 >>1281266 >>1281213 Definitely refrigerated trailer. That dark spot on top is the chute for the evaporator. As for the bottom, specifically for trailers with reefers on them so that any water inside can drain out.