Its the other way around.It makes a bit of sense, trucks are pretty lite in the rear, even with a 400 lb tongue weight (assuming 1:10) it might have a higher likelihood of doing bad things under certain circumstances so reduce liability early
/shrug
When there is a lot of weight in the rear, like heavy tongue weight, it pushes down on the back of the car which in turn lifts up on the front of the car, making for less forward traction.
Its not really a safety issue, just that RWD or AWD is better for accelerating traction towing than FWD. Probably just not enough 4K kits to go around, and maybe not even enough trucks to go around, so upsell people to the more capable and profitable AWD.
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