I, also, got Toyota to replace my stock Tundra mirrors with the tow mirrors. They are awesome! (I'll try to sell my old mirrors on Craigs list...I got the dealer to keep the boxes and bubble wrap the new ones came in so I can use them.)
When I had the Tacoma, I also used just about every kind of additional mirror that attaches to the existing and most worked pretty well but my favorites were these because
1- They have safety straps that hold onto them if they fall off, which happened a couple of times due to high winds.
2- Since they attach right on the mirror via a suction cup, it's easy to adjust to right where you want them by moving the existing mirror.
I always put mine as far out on the mirror as I could...really helps see around the RV.