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Hello,
The kits for semis include 80 AirTabs, and I'll bet that you need 2X that to do both the cab and the trailer.
They recommend 3 per lineal foot, so the clear space between the rain gutters on the roof of the xA is nearly 3 feet, so 8 or 9 will fit there. The sides are harder to be completely even, so I estimated 6 per side. 9 + 6 + 6 = 21
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