When I was considering a used truck and a frame stretch, I contacted Quadra Manufacturing and had a very helpful conversation with their technical guy (sorry, I don't remember his name).
Here's the contact info:
Quadra Manufacturing
305 U.S. 131 South
P.O. Box 536
White Pigeon, MI 49099
Phone: 269.483.9634
800.752.9815
Fax: 269.483.9636
I hope they can help with your questions.
__________________
Regards,
Alan
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