Just a random answer...
I towed from Ohio to Florida and back without a WDH and had no problems. Therefore if the WDH should fail in some manner I would continue to tow but at a reduced speed and with more caution knowing I was testing the quality of the bolts the additional weight is trying to shear off. I know I can do it for some time, I did it because of ignorance. Now I know better so will use my WDH so that I am as safe as possible.
Yes the engineers always leave a few pounds over the rating for safety and for folks who want to push to the edge. I am not one of them. If I am going to get killed, or kill someone else in a wreck I can only hope it was not because I did not follow the manufacturers recommendations.
Each of us gets to make those decisions all by ourselves.
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