I have seen this done as well. My system was drilled into the box frame, when I crawled under there appeared to have been an area that you can see to attach supports, rear just behind the rear wheels, and the front was about 1 foot inside of the cab doors.
I was advised not to attach the rear ones to the bumper extension.
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Bill M
2012 Georgetown XL 360
2011 Chevy Equinox - 2006 Chevy Avalanche
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