[gchappel]

I have a 2015 4wd Jeep Grand Cherokee. 25,000 miles and I had pretty bad wear on the outside of both front tires, and inside of both rears. Took the car to the local jeep dealer (first mistake) to get aligned before getting new tires. Service manager comes out, looks at the tires and basically says: yes you need an alignment, but we can't align it until you get the new tires. Aligning the car with the present worn tires will be inaccurate.
I "thought" alignment was based on the wheel/chassis. On a race car I never changed alignment each time I replaced tires.
What am I misunderstanding here?
Thanks
gary