Budget - credit card covers car rental bought with coupons?

i am trying to rent a budget car( intermediate SUV) for few days and driving few days to canada( allowed). I am getting a good deal if i use budget discount codes but will AMEX or VISA cover any damage? will the LDW work if i booked the reservation using codes?
I am declining the car rental's LDW. for liablity, i am using my GEICO insurance.
is the PREMIUM CAR RENTAL for $25 sold by AMEX is worth purchasing?
any knowledge or experience in this?
thanks

i am trying to rent a budget car( intermediate SUV) for few days and driving few days to canada( allowed). I am getting a good deal if i use budget discount codes but will AMEX or VISA cover any damage? will the LDW work if i booked the reservation using codes?
I am declining the car rental's LDW. for liablity, i am using my GEICO insurance.
is the PREMIUM CAR RENTAL for $25 sold by AMEX is worth purchasing?
any knowledge or experience in this?
thanks

Credit cards cover when you use coupons.
Don't use amex use visa they say amex is secondary insurance.

Credit cards cover when you use coupons.
Don't use amex use visa they say amex is secondary insurance.I am not so sure, for example, the AMEX free collision insurance terms state that it only applies when the reservation is fully paid with the AMEX. This would seem to exclude "free" rentals. If anyone has direct experience I would love to hear about it.





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what about if your redeeming rental company points? Do you need to buy the insurance? If so, it kinda lowers the value of any "free" rental you might get.