24 sheets of 1/2" drywall. ~1000lbs? Levels out the truck.
BTW, once I've hung the drywall in my basement, I'll be taping and mudding - feathering out the edges of the mud on successive applications. I did install some furring strips (1/2x1) on one wall instead of 2x4 framing to hang some panelling. But that's a discussion for another thread...