I asked my dealer the same question, here is what I got:
"Your passport does not have a walk-able roof, that is why they are so light. They have what they call a serviceable roof, meaning a person can check condition and seals by crawling on their hands and knees. Thus, spreading the weight out over a larger area."
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2018 Passport Grand Touring 3350BH
2015 GMC Sierra 2500HD Duramax Diesel
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