Believe it or not, R&L still had some dollies and tractors that were Jiffs. They weren't using them as designed when I started 10 years ago, the tractors were retired to city only and the dollies were just being used as normal in twins. You could spot them easily though because the tongue was narrower than the non Jiff. One main reason they stopped using them was they got nailed by DOT because the holes the pins went through were elongated beyond acceptable tolerances, much the same way slider pins on trailers can elongate slider rail holes. They used them up until 2008 or so. I've seen at least one old Jiff Tractor in Norwalk terminal being used as a shop truck to move trailers in and out. It had a 2008 IFTA sticker on it, no plate though. I haven't been to Norwalk for a few years though.