I mount the McKesh mirrors wider than the trailer body. Like cat whiskers, it the mirrors fit, the camper fits. Tended to brush back the tool takers in the before-EZPass days. And at this width I can see what's close behind the camper.
Yeah they're "stylish." They're also starting their 9th season of towing next spring. Worked for my Explorer and now for my Expedition.
I have the Mckesh too. I have had vibraition at high wind speeds, even with the straps twisted 1 turn.
Don't waste your time on the **** UNIVERSAL mirrors. They won't hold work with the textured mirror surface of the expy. Not a bad idea with the ratchet strap, but the they always sagged and the adjustment feet are ****-poor.
**** made the custom slip ons for my last vehicle and they worked great. I've requested to them for the 07+expys, but no release yet.