I go to Florida almost every winter for a week to get out of the winter. We have stayed in the same city 3 years. All 3 years I saw 2 guys with Tundra's pulling 5th wheels. I know for a fact that the 5ers were over the Tundra's yellow sticker rating. I know for a fact that both Tundra's pulled the 5er's just fine at least 2 years and there were no accidents. Both truckers were from the northern Midwest... Illinois, Michigan, somewhere up there.
I'm not advocating pulling those heavy weights with a half ton. I won't do it in my Tundra. I am worried about longevity and safety of my family.
However... people talk about stopping power being a big factor. What difference does it make if I am towing an 8,000 lbs bumper pull or 5er when it comes to braking? If the trailer loses brakes, I still have to stop 8K lbs, no matter how much payload I have. That weight isn't any lighter because its a travel trailer with 13% tongue weight rather than a 5er with 20% tongue weight. If anything, the 5er would be easier to control.
People talk trash about a 1/2 ton pulling 8,000 lbs not being able to stop in an emergency. But they drive a 1 ton dually with 20,000 lbs. You really think that dually will stop faster with a 20,000 lbs 5er than my Tundra with an 8,000 lbs 5er? Now... imagine the brakes go out on both trailers. I would bet my 15K lbs GCWR Tundra stops faster on stock brakes than your 28K lbs GCWR 1 ton dually.
Again, not advocating that people do it, just pointing out the hypocrisy that a 1 ton pulling 28K lbs is somehow safer than a half ton pulling 8 or 9K lbs...