When people talk about the scrub line, I always think of what happened to me once when I came over a hill after the Spring thaw in Minnesota, in my 62 Chrysler Newport. It had been my folks' family car before I got it, & it was actually sitting higher than stock, because the first thing my Dad did when he got it was to swap the 14" wheels it came with for the 15" wheels off of the previous family car, a 53 DeSoto. Anyway, I came over this hill, and the blacktop was buckled up in the middle of my lane. I didn't have much time to decide where I was going to go, so I just tried to straddle it. I was probably going around 50, and it caught the crossmember just below the engine. The whole car hesitated and shuddered. It actually bent the leading edge of the cross member, and it was massive on that car. So talk about the "scrub line" can be a bit misleading, because the assupmtion is that the road is completely flat between the wheels, something it often is not. I don't like to think about what would have happened if that car had been lowered, or even just at stock height. So take it easy on back roads, I guess.