I have been looking for a GOOD replacement towing mirrors for my 96 Suburban. I have the screw on mirrors which worked but not very well and were a pain to put on and take off. I hated to buy a new TV just to get some decent mirrors.
I also didn't want to use the fender mounted units.
I found the CIPA Extendable Towing Mirrors at Camping World and found them online for $328 delivered. They are 10 X 10, electric and just pull out when you want to tow, push back when you are finished. Glorious in the simplicity. They do look large but not objectionable. I did put them on myself and aside from one difficult bolt, easy to do in about 90 minutes for both. Saved about $240 that way. They also came with smaller stick on mirrors to broaden the view.