I hauled over 7,000 pounds over 650 miles in one shot, over the Cascade mountains. It was a 12 hour haul with one fuel stop that took minutes. In an 18 year old Toyota Tundra 4x4. No issues, no drama.
And the month before, hauled a 16 foot trailer loaded with thousands of pounds of stuff from Las Vegas to the SF Bay Area. About 650 miles also. No issues. Same old truck.