In this era of little houses and downsized lifestyles, the full-size, body-on-frame SUV has been on a big sales roll this year. The Ford Expedition has been a sales savior and redesigned models from General Motors are due this summer for the 2021 Chevrolet Suburban, GMC Yukon XL and Cadillac Escalade. Part of their popularity is a foundational sense of security on the road, tow ratings of 8,000 pounds and higher and a moderate price...