The "self tapping" bolts are a bit more than they appear...
Those bolts actually roll the treads into the sheetmetal instead of cutting the threads. A small but important difference when talking about the thickness of most unibody framerails.
Also...we go to quite some length to make sure that the attachment points are secured in 2 different planes, so one set of fasteners is always in shear instead of tension.
Having said all that...there is no problem at all with welding the cradle in the car if you have the skill, the ambition, and the resources to do it.
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Bret Voelkel
President
RideTech
Air Ride Technologies, Inc.
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