Yes, if you're going to get a 55% pro-rate out of your tire dealer, take that offer and run with it. I have Defenders on my '02 Camry that I got from Discount Tire. The car's alignment is checked/corrected about once every 12-18 months. and it has gotten strut replacements and control arm bushing replacements when my local front end shop deems it in need--at 266K miles, it gets taken in for a "suspension shake" to see what's overdue for/about to need replacement about once a year. The tires get rotated at DT's 6K recommendation, and those rotations are in their database. Despite this, the Defenders just don't last to 90K. That's OK by me, as long as DT is willing to slap on another set for a reduced price like you've been offered, I'll keep putting on Defenders. They're fine tires otherwise, and the tread life warranty has worked out well for me.