I use two carpenter squares and a tape measure , have some one hold one of the squares against the axle flange, no brake drum or rotor on the axles and measure out around 15 inches from the center of the axles on both sides to the front side and see what you get, then do the same towards the rear and then if you can straight up and down. The stock wheel tubs limit how far you can measure straight up, what ever you can get use the same length measuring straight down
I like to see less than 1/8 inch variance front to back with the front being narrower for toe in, no variance straight up compared to straight down
Please let us know what you do no mater what method you choose