Adjust it when you pick up the unit. For now just go in the middle holes. They are all going to vary based on the TV and bed clearance.
Any good dealer worth their salt should provide that service for you. All mine did when we picked up. It's only a 10 minute job.
2014 375 BHFS Eagle Premier
2014 Ram 3500 Longhorn DRW CC
6.7 CTD, Aisin, 4.10's