I believe you are thinking of the Ford Excursion, sold by the Ws to someone in Ky, which was later searched and evidence retrieved while under it's new ownership. .. blood evidence, carpet samples, etc.
Edit: No, don't have a link, but I did search a bit.
Edit: From the Media and Timeline thread: "May 18, 2017
BCI searches a Ford Excursion, retrieves items for testing and submitted as evidence"
Edit: AW's ad, Excursion for sale: https://i.imgur.com/OGZiczt_d.jpg?maxwidth=640&shape=thumb&fidelity=medium
Thanks, Col! I should have double checked, I knew it was a Ford. So we don't know much about the F150.