So back to LGI's point, how do you feel about molding differences between Prowl and Smokescreen, or between Sideswipe and Red Alert? Specifically as it relates to their vehicle modes. Because yes, Hauler is just Grapple run through the season 1 character model filter, just with no robot mode ever seen.
If you're OK with those other characters sharing a mold, then Hauler is just Grapple. If you're not... well, then you were bound for disappointment anyway. I can't see TT paying to significantly remold Grapple to release him as essentially Grapple, now with a slightly different vehicle mode.