THE WA1877 LO PROFILE EXTENDER BAR IS DESIGNED TO LOWER THE MEASURING POINT OF THE TANDEMS FROM THE HUB SO THAT MEASURING THE TRACKING OF LOW PROFILE TRAILERS SUCH AS CAR CARRIERS, MOVING VANS AND LOW BEDS CAN EASILY  BE DONE.

THE EXTENDER BAR IS SLIPPED OVER THE MEASURING ROD ON EITHER OF THE WA1888 TANDEM TRACKER SERIES OR OVER THE LO PROFILE SLEEVE ON THE WA1890 TANDEM TRACKERS FOR ALUMINUM WHEELS, PLACED AGAINST THE SIDEWALL OF THE TIRE AND LEVELED WITH THE LEVELING BUBBLE.  MEASUREMENTS CAN THEN BE MADE BACK FROM THE KINGPIN EXTENSION,  EITHER THE WA1889 KINGPIN EXTENSION FOR STANDARD TRAILERS OR THE WA1887 LO PROFILE KINGPIN EXTENSION FOR LOW PROFILE TRAILERS.