I know two custom harvesters running about 10 STS (96 and 97). I've heard from different people that they had some final drives (front wheels) fall off. But I haven't talked to them in person yet. The STS are based on the 9500 frame. To make'em fit on the combine trailers together with 9610 they put spacer in between the front wheels. That might put too much stress on the final drives.