[Richard]

Backward first then forward to simulate what happens as you drive down the road. If you measure the toe after just backing up it is way different. It will be more toed in after backing up. As you roll down the road the forces on the tires want to move them to the outside. That is why they are toed in, so that rolling down the road they become neutral. If you back up, the forces on the tire are reversed causing them to move towards the center of the coach.

Trivia : Front wheel cars are usually toed out on the alignment rack because the pulling force of the drivetrain is higher than the rolling force of the tire. The pulling force of the drivetrain moves them to the center thus setting them up slightly toed out results in neutral toe while under power.

Bay pic was a fumble finger, and I don’t know how to edit it out. The remove button didn’t work for me.