I bought a small auger wagon (grain o vator  10 )    The top of the auger wagon is 6' square.   It is 42" from the bottom of the bottom auger to the top of the 6' square .   
Now I will admit that math was not my strongest subject in school. (I'd rather be in the ag shop) 
Can someone help me out and tell me how many bushels of corn this auger wagon should hold?