Watch videos of towing failures. I'm serious. Not to scare people or make fun of others (who may have been harmed) but go see what happens in real world. In real world dashcams, fish tailing pops up more often that I'd like, and sadly it often ends with total loss of control of the vehicle and a crash. A smart person will start looking at 'how to prevent fish tailing while towing".Do a little research, listen to others with experience, knowledge is power.
There's lots of vids of toy trailers on treadmills to demonstrate fish tailing at various weights, but this Dutch one below adds a unique point IMO. It shows the affect of adding payload to the towing vehicle. Most vids about fish tailing only redistribute weight on the towed trailer. You don't need to speak Dutch to get the idea: adding payload to towing vehicle instead of adding that weight back to the towed trailer also reduces fish tailing. And yes, like the English speaking videos say, adding weight behind the axle of the towed trailer is just inviting fish tailing. So my general rules are:
1) pack the truck cabin 1st (front axle)
2) pack the truck bed (rear axle)
3) lightly pack/load the trailer -- go ahead of its axle / towards the tongue
4) resist urge to heavily pack/load the trailer, and behind trailer's axle = Just Say NO!
5) check tongue weight / sag (measure sag, or I just bought a Weigh Safe ball to be safer)
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