Will this fit to my 2018 highlander xle? anyone tried it?
Yes, it can fit 2014-2019 Toyota Highlander.
So, the lock on the caps keeps them from flying off or losing them in an aggressive carwash?
This cover is a snap structure inside, easy to loosen after a long time. Many customers told us that this covers had be lost without realizing it, so we upgraded the design of the lock structure.
Clearance above roof -the distance between the roof and the bottom (or top) of these cross bars?
It is approximately 4 inches tall.
Does it come with the wrench and hex key to install?
Yes. It comes with everything you need to install it. Really easy to do and fits great.