Thanks for the quick responses. I know Jon's point about not seeing any better than I do now with the present mirrors is true, of course (now that I think about it.....duh), and I suppose I could have marked off the distance to the rear where the rear bumper/quarter of the towed vehicle would be and check to see if I can see those points, but I guess I was too lazy to think of it.

The reasons I asked are; the chrome plating is beginning to blister on my current Ramco mirror arm brackets, I already have the color monitor (Alpine system). Jon's point of using rear corner cameras seems better yet (the existing system rear fish eye lens camera doesn't extend vision past a few feet), and then I could see both lanes' blind spots as well, but I will still have to replace the mirror arm brackets near term.

Thanks all. Keep it coming.