Wow, you and SD Fan do pretty good with your tires. My OEM Goodyears on my Town & Country are darn close to wear bars at 44,000 miles. Could I squeeze another 10,000? Probably, but a set of 4 puts me back about $350, so I go with the new tires
I've never been a fan of rotation. Too many times after that I end up with a car that pulls to one side after rotation. I do it once at maybe 15,000 and that's it