Phil, I don't have the correct answer to your query but I do know that if the winches are heavily loaded the frame will twist before anything breaks. When I was working on my artillery tractor I went through three badly twisted chassis before I found a good one. The best chassis came from a truck that had spent it's life as a tow truck.
Cheers,
Barry
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Every twenty minute job is one broken bolt away from a three day ordeal.
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