they are ALL OVER here, you see them at least everyday. Some of those things seem bigger than the 4runner, they must have like 30 inch rims or something. Ive even seen a early 90s lexus like that, so its not just the GMs (although they are mostly all old monte carlos impalas caddys and buicks.) I did see an old GTO one day that wasnt half bad though, it was cleanly done and the rims were way over 20 in but not as flashy as most.
They replace the spindles with 4x4 s10 or other truck spindles to raise it, since it is a spindle lift, they have incredible ground clearance.