The 4 Runner isn't any worse for scratches than any other manufacturer. It's the nature of the beast with modern finishes--clear coats. So, where I don't know jack about things under the hood, I feel pretty good about my knowledge when it comes to these issues. Here's my take:
I would recommend that you use Meguiar's philosophy when it comes to surface repair: Move from least aggressive to more aggressive and NEVER go to fully aggressive--save this for the professionals. So, in this context, first try Meguiar's NXT Generation Wax II. See if that stuff gets the scratches out or covers them up. Then, Meguiar's Professional Line Swirl Remover #9--maybe a couple of applications followed by NXT Gen II. This step would actually repair the scratches rather than cover them up. I would say that if you are going to get these things out, this will do it. If that doesn't work, then try Meguiar's Professional Line #2 Fine Cut Cleaner. This stuff is mildly aggressive, so go gentle until you understand the product. It will leave a haze. Don't freak. Follow with #9 until the haze is completely gone, and finish with NXT II.
Personally, I am not comfortable with buffers--BECAUSE I AM A WIMP. Seriously, the technology is such that most anybody can use them--I just am a wimp about it, and I prefer hand work. Having said that, my process above should work if these scratches are workable by the novice. Anything beyond that should probably have a pro's input. Just my thoughts. Hope it helps.