Alt hot white and red wires, neutral black? How to connect motion detector switch
I'm hearing a lot about the traveler.  3-way switches don't have a traveler.  They have two. 

This is what a 3-way circuit looks like: 



As you can see, one of the travelers is hot and one is not.  Throwing the first 3-way switch switches which one is hot.  

So anytime you have a 3-way switch, notice the two wires that are on brass screws, or not on the "common" terminal.  Those are the two travelers.  What I do is go straight for my roll of yellow tape and tag both of them yellow on both ends.  In your case that is the red and white wires.  They are not neutral or hot or anything else you want them to be, they are travelers.  But depending on your smart switch they can be re-tasked to be something else. 

Since you are operating in 3-way mode, you must read the Hubbell documentation for how they want you to wire the circuit.  It also depends on how the 3-way complex is wired.  Sometimes you do not have a choice and are not able to install the smart switch in the location of your preference simply because there needed wires are not present in that location.