看看這個。
“All four major networks require cardholders to charge their entire rental car purchase on their credit card and decline supplemental insurance/Collision Damage Waivers offered by their rental company in order to be eligible for coverage.
隨便google來的。免得說是常識, 又被說太絕對。
http://www.cardhub.com/edu/rental-car-insurance-credit-card-study/