Getting data for the US that is guaranteed reliable is becoming more of an issue as car makers shy away from releasing any more than they can get away with. Tesla doesn't even bother, an attitude I'd gladly ignore the company over. I can get information but it is variable.
GM are pleased with the performance of their Silverado truck. Added to its twin sibling - the GMC Sierra - it actually outsold the Ford F-Series. Ford had transitional model constraints which affected sales though. With the market depressed, most models were down.