I could have used that thing during a previous recovery of a flopped vehicle-
I was at the top of the hill, flopped vehicle was at the bottom- Incline of the hill created a few contact points with the sharp rocks-
I used a few floor mats, in addition to my synth rope sleeve.
Looks like it would take up alot of space though.
Also if the terrain is rocky , you may likely have mulitple contact points with rocks.
A simpler design that would do the trick is to get a 1 foot piece of 1 1/2" tubing, bend a slight arch in it, then cut a slot lengthwise wide enough for your line to fit past. Radius off all the sharp corners and possibly weld a few legs to hold it steady. Much smaller and easier to use.
Maybe I'll fabricate one up to test out, on my next trip to the Hammers.
When I have winched across abrassive rocks, using your hi-lift flat on the ground works great to prevent contact.