That's five cubic feet of cement.

Thats just ONE wheelbarrow of concrete..somehow, I dont think your weight
calcs are right.

I've hauled delivered concrete in my large 6CF contractors wheelbarrow
from the curb to the front of the house/driveway (didnt want the LARGE
concrete truck driving on my driveway) and dumped into prepared forms..not
full but probably near 5CF per load...at least 4..
Must have made 12 runs..over 2 yards. Not an impossible task