lower body work

First time posting here! I have a '98 LX470 that's been in my family since new - I was born in '96 so I've literally grown up in this truck. It's still running strong, but I let the rust get away from me in the back and now I'm paying for it. I need to repair rust on both rear quarters behind...

I am looking at possibly getting a pretty clean 2013 LX-570 that has really cherry body work and paint. For obvious reasons, I don't want to butcher it with a haphazard trim for some random bumpers. With a 20 degree rear departure angle, I know I will be in trouble if I don't do something. I...