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My own Scientific Wild-Ass Guess (hereinafter: SWAG) is that it would be a lot easier to stick some Coroplast underneath to keep air out of your parachute. Grill work is amazingly draggy. If you want to do some serious work, cut away as much of that parachute as you can with a reasonable angle on the Coroplast, and make a smooth little spoiler tip to trip the air up into a stable vortex. To restore the original lines, put a heavily cambered wing at the bottom to really put some air into the vortex.
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There is no excuse for a land vehicle to weigh more than its average payload.
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