You are almost always better off with mirrors that extend out farther.
I agree with NewBlackDak, once you hook up, you will be able to see (or not) very quickly.
I have found that the right side (passenger side) is the most difficult for me to see adaquately, but that is my experience over many trailers but the same tow rig.
Maybe you could purchase the mirrors, see if they do what you want and return it/them if not.
I actually use that mirror you mention as a spare. It works fine, but it's a bit heavy and can be a little tedious to install. The rubber caps that contact the truck mirror housing can come off and make things a little dicey-But they do work
I prefer the slip on mirrors that CIPA makes, like the 11300 for the Tundra. I have a pair for my '99 E350. that work very well. They fit well, don't vibrate and there is not much to lose. Call CIPA to see if they have slip-ons to fit your mirrors, they have always been very nice on the phone.
2013 Starcraft 266RKS
1999 Ford E350 V10 Chateau (6.8L, 4.11 LS)
2005 Cedar Creek 31LBHS
2001 Sprinter 303BHS
1997 Mallard 33Z
1990 Starcraft Starmaster