Your cars last as long as how you treat them.
Current Work Suburban 67k
Secondary Work Yukon 281k
Previous Work Suburban 275k
Previous Work Chevy Pickup 260k
Every one of the vehicles listed above pull/pulled a 16' Carhauler loaded with up to 7k of wood floor and equipment. Every one of them ran great and didn't burn oil when I sold them.
Take care of your shit and it lasts, well at least in my personal experience, anyway.