Fits 8 and 10 bolt wheels.
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Place WA1889 under kingpin. Follow instructions provided with tool.
Go to rear of trailer, 1st tandem. Thread bolt extenders on to bolts, be careful not to cross threads. Do not fully tighten. Place extender plate over theaded studs. Now tighten bolt extenders finger tight only. Place knobs on studs and finger tighten.
You can lower the WA1889 bubble platform all the way to the floor if you have to to clear landing gear or any other obstruction. Center bubble level. Now you can hook tape to hook.
Now you can proceed to take measurements to center pin on tandem. Measure to the edge of pin, write down measurements.
Now you can hook tape over pin and in groove and measure to the next tandem extender pin. Write down measurements and repeat on the other side of trailer.