We left at about 2 a.m. on the 1.75-hour tow from my home near Los Angeles to San Diego. As my two-man crew lamented, we really needed a bigger boat to tow test with this diesel dually. The crew cab with a diesel and 3.73 axle ratio boasts a 20,000-pound tow rating, so it was definitely overkill on this trip. While I worried about an overly stiff suspension and a jarring ride, the ride of the 3500 proved smooth, quiet and comfortable. The Denali HD also bristles with safety technology, including lane-change cameras, lane departure warning (it emits a startling buzz on affected side of the seat), StabiliTrak with trailer-sway control, front and rear park assist and a rear-vision camera. Interior comfort features include electrically adjustable front bucket seats, dual-zone climate control, power sunroof, cooled/heat front seats, touch-screen navigation, 4G LTE Wi-Fi hotspot, Apple Carplay and much more.