I was as stumped as you. However, keep in mind the current generator I have is an older 6500 model. it is not an IS, but a 'black max'. Its also a loaner from my father in law. So, in the interest of having ownership and also a much much quieter machine, we opted to buy these. When not in the heat of the Texas summer tailgating, we can choose to just run one and be even quiet and that much more efficient gas wise.
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2013 Alpine 3535RL
2012 Ford F250 Super Duty 6.7 Turbo-Charged Diesel
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