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You want to measure each wheel against the frame, not against another wheel. If everything is referanced to the frame, there is less margin for error.
Get two pieces of fishing line, about 12-18" long. Tie a weight to one end of each string - I use a washer. Tape the strings to the top of the round tube - one in front and one in the rear. The strings should hang down the same side of the tube, and not touch the ground.
Use a laser level ($15 at Ace) and cast a line that intersects both strings. Now you have a laser line that is perfectly aligned to the frame. Take all your measurements off that laser line.
Sometimes it's easier to do the same thing on both sides, so you have two laser lines to measure from.
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