One of
@Skubersky's videos he posted recently was an interview and the guy said that max capacity is 4 vehicles dispatching at 122 seconds. That's a theoretical of 2124. In reality with people being slow and whatnot I bet its more realistic of like 135s dispatches for around ~1900 an hour.
Breaking down the math more, thats an 8:08 cycle for the vehicles and with the ride clocking around 6:15 which only leave 113 seconds at load and unload. Someone here gave a required time for the vehicles to charge but I forget the exact number.