Ford sells a lot of trucks so I wouldn't want to make any assumptions about what sales would be like with a Ford badge. Sales might be even better.

But I do agree with your point, the Porsche badge is what many buyers are after. But the reason for that is Porsche's well deserved reputation for engineering excellence and high performance vehicles. The Cayenne is no exception to that reputation. It is the best engineered, highest performance SUV available. Ford could not have made the Cayenne.