You can go to Ford.com and search your local Ford dealer inventory, or 'extended' inventory including neighbor Ford dealerships. And Ford dealer can request a local Ford dealer give them a truck that is in stock, in order for them to complete a sale.
Inventory search Then once you see several trucks, you can select one, and click on it. Then click on "View Window Sticker". The GVWR is listed there, on the window sticker, and might say anything from 6,500 GVWR package to 7,700 GVWR package.
Good luck!
Fred.