PSS Settings > Webstore (Trader Interactive)

Trader Interactive

Scroll to the bottom of Settings > Webstore.  Enable units syndication to Trader Interactive

Feed URL - This is the feed URL that you would provide to Trader Interactive.  
The URL for PSS users is https://  
(Replace "yourdomain" with your store's actual web domain)  

If your website is then the URL feed that you need to provide to Trader Interactive is

Enter Dealer Name, Dealer Phone, City, State, Zip
You must categorize your units from PSS Webstore > Units.  Highlight a Unit and click the Quick Edit button to categorize.  Once you have completed all the steps above and confirmed that Trader Interactive has your Feed URL you simply need to categorize the units.  This automated image breaks it down.