Ford, GM, and Ram are locked in a fierce battle to build the best truck tailgate

• Ford just unveiled the 2024 F-150 pickup truck.
• It has a new tailgate design called the Pro Access Tailgate. 
• The big truck makers have been in a battle over who has the best tailgate. 

"If it ain't broke, don't fix it," does not apply to the cutthroat and highly lucrative US pickup market, where the biggest players constantly try to one-up each other with flashy new features.