Just as a counter-point, all of the wiring for my house battery, from the ACR to the battery in the rear of the van, are 2-Gauge jumper cables. I purchased them locally, so I could open the box and inspect the strands (visible at the gator clamps) and verify that they were of appropriate construction.
Aside from chopping off the clamps, I also split the two cables apart, so that I could wrap each cable with an abrasive-resistant guard for the entire "outside/underbody" run. A fuzzy closeup:
I'm not sure what "overland winch approved" is supposed to guarantee, but these have served perfectly since 2011 with zero issues.