Now this my friends is a Wrecker

[Wayne M.]

Wow that's some unit! Looks like beyond recovery and it's doing crane work on that mixer. Is there a rigger in the house?

 

[JR]

That's the first wrecker I've ever seen with two winch lines! That's definitely getting into crane territory there. Auxiliary whip (single part) line for smaller jobs and tailing and a main block for the big work.
I wonder if that block allows the driver to reeve more parts into it? It would also depend on the winches capacity, size of the line, etc compared to the capacity of the truck. Our cranes all have two winches, one whip line and one block that is reeved with 4 parts. It is a good combination that covers the load charts in most configurations unless we have to lift something extremely heavy. Usually we will just resort to a bigger crane unless were already using the biggest one available. Just earlier this week I had to re reeve our 130 ton unit to 6 parts to make a big lift.

I just noticed in the picture lifting the mixer he's got his block line ran over the auxuilary extension sheave. That extension is there to create some distance between the two winch lines so they don't get tangled up but because it is so much further off the tip of the boom is always used for the single part line.