I test drove this on the highway and it's fine. No noticeable wind noise vs just the Thule wind fairing alone. Might even help some.
Doesn't vibrate or whistle at any speeds between 0-70mph.
This is a 100 watt panel. It's on a carbon fiber backing so it's only like 5-10 lbs. Super strong. I wanted a solar panel for trickle charging my victron/battleborn system. Should be enough to offset any parasitic draw
check out https://www.lightleafsolar.com
I used 2020 aluminum stuff (like 8020 but smaller) to make the frame to support it. Never tapped anything before, but aluminum is easy to tap, don't let that scare you off.
the downside is that this adds up quick. $400-500 for the solar panel and double that for all the Thule stuff, but I had the Thule stuff already from a previous car I had. The Victron MPPT solar controller was another $200 too