I got 11 seasons out of a set of McKesh door mount mirrors. I'd still be using them if my new truck did not have factory towing mirrors. IMHO, the door mirrors, like McKesh, are the best choice. Easy on, easy off, excellent vision, tremendously durable.
'13 Excel Winslow 34IKE
'12 GMC Sierra 3500HD
Previous RV's: '03 MobileScout Titan 29DBS; '01 Sunnybrook Lite 2708 SLE; '99 Coleman Utah
Previous TV's: '02 Chevy Suburban 2500 8.1 4.10; '99 Chevy Express 1500 5.7