i dont i saw a guy get killed like that, he got in a hurry when helping some one out and hooked to straps togeather with a clevis/ d-ring and one of the straps broke and the d ring whent flying and hit him in the back of the head!!!
with the right safety precausons it can be made pretty safe (throwing a jacket over the d-ring), but why take the chance
u saw that? couldnt have been pretty