I bought my Yukon XL new in 2015, and have never had a single issue. Without going into details, I've read quite a few posts (including the previous on this thread) relating it to tire/wheel size. I've got the factory wheels and tires on mine and nothing. I mostly drive city, but for the few "road trips" (500+ miles) and high speeds (the fastest I've ever had it up to was 95 mph) I've never had an issue. I think the best advice was already posted; "Test drive one".