In the heavy duty pickup truck arms race, GMC has rolled out its latest weapon: the 2024 Sierra HD. Surfing trends in these high-tech, high-performance times, the Sierra HD not only offers a raft of best-in-class claims but also sets a new bar for luxury. The mega-truck throws down the gauntlet on best-in-class towing, screen size, and trailering tech with 14 camera views and a slick feature that renders a gooseneck trailer invisible so the driver can monitor objects behind it. Heavy duty capability commands big sticker prices and GMC’s premium brand claims 31% share of the over-$75,000 market…