[Richard]

You are going to chuckle at my redneck ways, but my numbers have been confirmed a number of times on high zoot alignment racks.

For toe in, I utilized the outside rain sipe on the Michelins 365 tires. It is just the width of mason’s twine. I have four plumb bobs. I back the coach up about 50 feet. Lower the suspension, and allow it to come to ride height. I drive forward onto my RV pad. I hang the four bobs front and back so they just clear the ground. I use two tape measures. I call this rolling toe, because it really represents what the tire sees rolling down the road as opposed to being on a turntable.

For camber, I use a digital level against the wheel face. I measure on a pad. I turn around and park on the pad the opposite direction and remeasure. I average the number. The reversal of the coach takes out any slope of the pad.

For caster, I have used the turn the wheel 20 degrees and use the digital level method easily found and explained on line. But in this case I hung a plumb bob, and measured distance from the vertical string to the pivot points at the top and bottom A arms. Tangent (caster angle) = difference in measurements / height between pivot points). Hard to trick gravity and a taut string!