October 2026 haunted house: 300 people per night, 6 hours. Units?

I'm planning a haunted house for October 2026 with 300 guests per night over six hours. It's a high-traffic event with constant scares and lines, so I expect steady restroom use. The ground is grassy and level, and a vacuum truck can access the placement spot easily. I'm considering standard units for cost, but I want to avoid long queues that break the scary mood. Should I go with all standard units, mix in some deluxe units with sinks, or consider a restroom trailer for better guest experience? How many units total would you recommend for this setup?