Hi, I'm new to this forum just having purchased a 2012 4Runner SR5. I got the 4R because my old towing vehicle (1998 Sienna) was just not up to towing my trailer. I've got a vintage Aladdin trailer with a weight of about 1700 lbs. The width of the trailer is 7' and 15' long. I found on this site that the actual width of a 4R with mirrors is 84" which is the width of the trailer. My question is: How do I properly adjust the add-on mirrors, all of my previous towing experience has been with trailers I could see over. Thanks!