What is the proper way? mid wheel to bottom edge of wheel opening??

 

Thats one way i guess, but i've also read of people just measuring from the lowest part of their front and rear bumpers to the ground. Thats for suspension/body and tire lift total. If your installing a lift but keeping the same tires then i'd do it this way. If your getting larger tires and lift at the same time, then do it the way you were talking about, in order to see how much lift the kit gave you total.

 

Since these vehicles are produced pretty uniformly, you can measure from the body parts, but ideally you would measure from fixed points that are not subject to flex or variations in manufacture or damage tweak etc. The best way is (for example in the rear) from the axle to the frame or something like that. See what I mean - not subject to being off because of different wheels or body flex etc. But then again you aren't measuring to the thousandths - so any fixed points are fine. Top of wheel opening to the hub center, bottom of rocker panel to the ground, whatever. It is handy however to measure fixed points that aren't unique to your rig so you can compare your measurements with others. (What I mean is don't measure from your flares to your tires because that will be different on someone elses truck.)