With unlimited money, sure, but your typical prepper would be able to fund a decent portable gas generator and jerry cans (or even a natural gas line) without a need for financing.

Why does the prepper assume there will be electricity to charge his car?

If you can choose between a truck that becomes a dead weight when the nearby power plant comes offline, and a truck that won't, the prepper mentality is to choose the latter.

Take it from a Ukrainian.

PS: my dual-fuel gasoline/LPG Renault Twingo in Poland will outrun any Cybertruck on the continent.

And, unlike electricity, you can stockpile gasoline.