Amex is a bit better for coverage, as they cover $85k and less, so a bit more leeway. Honestly for travel, Amex's policies and concierge service are very hard to beat.
This is from the Simply Cash Preferred, but I believe all the other cards that provide car rental insurance are similar.
https://www.insurance.americanexpres...erts-16388.pdf
Code:
The following vehicles are excluded from coverage under this Certificate:
1. Automobiles or other vehicles which are not rental autos;
2. Any vehicle, in its model year, with a Manufacturer’s Suggested Retail
Price (MSRP) over eighty-five thousand dollars ($85,000) Canadian,
excluding all taxes, at the place the rental agreement is signed or
where the rental auto is picked up;
3. Vans, cargo vans or mini cargo vans (other than mini-vans);
4. Trucks, pick-up trucks or any vehicle that can be spontaneously
reconfigured into a pick-up truck;
5. Limousines;
6. Off-road vehicles;
7. Motorcycles, mopeds or motor bikes;
8. Trailers, campers, recreational vehicles or vehicles not licensed for
road use;
9. Vehicles towing or propelling trailers or any other object;
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10. Mini-buses or buses;
11. Any vehicle which is either wholly or in part hand made, hand finished
or has a limited production of under 2,000 vehicles per year;
12. Antique vehicles, meaning a vehicle over twenty (20) years old or
which has not been manufactured for ten (10) years or more;
13. Tax-free cars