Originally Posted by
guv1976
You'd have to check carefully the terms of the Chase coverage, but I expect that they require you to reject all optional coverage for loss or damage to the rental vehicle in order for the Chase coverage to apply.
If you plan to continue to rent cars costing more than $75K, you might be better off enrolling one of your Amex cards -- even ones with no annual fee -- in Amex's Premium Car Rental Protection program. For $24.95 per rental (less for California and Florida residents), you are covered for up to $100,000.
This is almost certainly the case - the vast majority of credit cards that provide "primary" insurance stipulate that any sort of LDW or optional coverage purchased will replace the coverage from the card, and you wouldn't be able to file a claim with it. I would also explore the possibility of that premium car rental program mentioned, or consider purchasing a complete LDW for vehicles that are still more expensive than those coverage limits if you want to continue renting those without relying on any personal insurance you might have.
You'll find basically all credit cards that I'm aware of that offer rental car protection (Visa Infinite Privlege (Infinite), Amex Reserve/Platinum, CSR, etc) all have roughly the same dollar value limits for coverage and all of them explicitly exclude all coverage when any is purchased from the renting agency.