Maybe he doesn't want to get parking lot dumpster juice and vomit on his hand truck's wheels.
Maybe it's a gift for someone, and he doesn't want to show any wear on the wheels.
Maybe he bought the handtruck, and saw an unreturned cart on the way back to the car, so he's putting it away.
Maybe the hand truck is defective, the wheels don't turn, and he tried to take it back, but he forgot the receipt.
Maybe he plays with dollies.
Or (pic related)…