Joined: Aug 2010
Posts: 12,730
Likes: 2,106
From: Madison, WI
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
Can't comment on the Vaya as I have never ridden one, but the Logo is rated at 40 kg (88 pounds), Ergo is rated at 10 kg (22 pounds).
I am sure that I have overloaded my Ergo and it continues to work great. My Logo stays solid with a heavy load but I don't think I have put a full 40 kg on it, that is a lot of weight.
You did not say if you are installing the racks or if the bike shop already did. If you are, I suggest blue loctite on all rack bolts.