Unless the grant includes "build trucks" the money can't not be used to build trucks. It would not be necessary to build a truck to test the system. By an engine or develop just the engine. NKLA can't be the only company that has hydrogen fueled engines.
Anyway, I would vote my shares to allow the funds.
Combine with other company.
Get funds from other sources, i.e., State or corporate (having an interest).