This area above the Tesla Semi factory is the EOL parking lot for the eventual 50K per year semis prior to them being delivered to customers.
know orders:
Einride 500
WattEV 370
PepsiCo 100
Walmart 130
UPS 125
Big F Transport 40
Anheuser Busch 40
Sysco 50
Many others have trialed them and reported positive results.