So, as noted elsewhere, I have been trawling the archives of Heritage Auctions. Way back in the misty days of 2003, it seems they hosted a series of auctions for More than Meets the Eye storyboard segments. Since I thought people might want to see these, I have saved the full-sized images and am rehosting them.
Those two pages were said to specifically be the work of artist Victor Dal Chele. The rest of the storyboard auctions state the artists as "unknown", although some of them seem like they might also be by Dal Chele, going by that sample.
(This Ravage is adorable.)
Looking at these, one of the things that caught my attention was the fact that, in 06, Hauler wasn't drawn as a crane-truck, or really at all as anything resembling the configuration of the Grapple toy. Out of curiosity, I checked the MTMTE script that Jim tossed up some months back, and it turns out that Hauler was originally scripted as a tow-truck. Could it be that Hauler was originally meant to be proto-Hoist instead of proto-Grapple? The name does fit a tow-truck better, but the real answer is probably forever lost...
Anyway, enjoy the history!