Wrong stating an LT is an LT. As LT's made for trailers are generally not found on any truck and not made at all the same at true Light Truck tires...not even close. So don't be fooled.
A LT tire is a LT tire regardless of its intended position such as a steer/drive or trailer position.
I have no idea where you get the theory that the LT G614 RST isn't a LT tire or as you say isn't even close to one.... but it sure didn't come from Goodyear.
The G614 RST is simply a LT tire that Goodyear designates for the "regional service trailer" industry. Don't be fooled into thinking its a ST tire that Goodyear mislabeled some how.