Brents right, not only does it have a chance to fling your come-a-long if something snaps, the strap will stretch a few feet before the vehicle budges so instead of the 10ft length of the come-a-long you only have 7-8ft before you have to re rig the line to pull again.

I use two 20ft chains when I use my Hi-Lift to pull me out. If something breaks the chains are so heavy they just fall to the ground. Plus they don't stretch so I can use the full 4ft of the hi-lift before I have to re-rig the chains to pull another 4ft.