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Expedition Leader
I've had several truckbed trailers. When the tongue is too short they wobble badly. When the tongue is correct, or slightly long, they tow fine. The magic number for me has been tongue = 2.5 times the width. The only other thing, one axle had an LSD in it and didn't like to track around corners.
Wow that's a long tongue. My current trailer is only 4' thats what I was shooting for.