Your article is a bit out of date (July); F-series sales have slowed down since then, with increased costs plus a plant shutdown (hurricane) both being blamed. Regardless, a single product line is responsible for a disproportionate amount of Fords profits, and the cost of that product has been going up significantly; there's a reason why the 84 month auto loan is a thing. Investors are VERY worried about how Ford is going to whether the next recession, which combined with it's relative lack of EVs or a self-driving initiative is dragging down it's stock price (down 50% over the past 5 years).
I've never said FCA wasn't doing well, just noting their CEO has been trying to sell the company or parts of the company.
https://jalopnik.com/fiat-chrysler-boss-openly-considers-spinning-off-jeep-1794700937
https://jalopnik.com/shit-got-too-real-for-sergio-marchionne-1793356952
https://jalopnik.com/chinese-automaker-geely-offered-to-buy-fiat-chrysler-fo-1823530854
"Blah blah blah. Politics this and politics that"
Note: Before Trump the price of cars was getting lower. I remember. Truck started at 50k when Obama took office and started at 7k when he left office. Now Trump has brought the starting price up to 90k for a base model.
Note on the Note: I just made all that up.