I am planning to rent a car, probably from Alamo at the Royal Sands, for two weeks. My VISA card covers collision, theft, damage with $0 deductible. My CHUBB home insurance provides $5M Canadian in excess third party liability insurance for rental vehicles worldwide. I have confirmed with CHUBB and my broker that our Cancun rental would be covered. I would bring the documentation with me. Is there any reason why I would still have to buy Alamo's excess third party liability insurance?