Not really. Credit card coverage is secondary insurance, which means that your automotive liability insurance is the primary. Some cards offer primary coverage, usually for a fee or with a fee-based credit card.

That's problematic if you don't have insurance, or if you are in a risk category where some accident or damage to a vehicle will result in policy cancellation or a rate hike with your personal insurance. Some personal policies have different limits or gotchas for incidents related to business travel as well.