The Hickey one is very similar, and I've liberated a picture from the website of the folks who currently use that name...
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The inner brackets you're talking about are indeed very important to avoid sheetmetal damage.
Is the sheet metal cracking as a result of the carrier?
Is the sheet metal cracking as a result of the carrier?
Would adding a piece of sheet steel on the inside of the tailgate where everything bolts up help distribute the load and prevent cracking like that?