Not including overtly premium nameplates like the Cadillac Escalade, five of the seven available truck-based full-size SUVs available will either be thoroughly refreshed or completely revamped for the 2015 model year. They also happen to be the category’s five top sellers. It’s a tight knit segment, one with which the vast majority of automakers have chosen not to bother. But the parties that do field candidates aren’t giving up on these people-carrying towing beasts.