5hp is good for 4- 8 inches. I have a little 2 cycle. good for less than 4 inches. luckily I have an old plow. I just plowed the whole front yard into a pile.
On a side note, I went delivering today no pix,but not nearly as bad as 1978. yes nice drifts occasionally, but no tunnels or chanels. I now feel like a dope for not opening by noon.