December 2026 wedding: 200 guests, indoor/outdoor. Units needed?

I'm planning a December 2026 wedding with 200 guests, mostly indoors but with an outdoor ceremony and cocktail hour. The venue has two small restrooms inside, which won't cut it for the crowd, we're talking a mix of ages, from grandparents to kids, and we'll have a full bar and dinner service. It's a winter wedding in Tennessee, so the ground should be firm but I'm worried about freezing temps. The rental company can get a truck within 30 feet of where I'd place the units. I'm debating between standard porta potties and a restroom trailer for better guest experience. How many units do I need for a 6-hour event with alcohol, and should I prioritize a trailer or clusters of standard and ADA units?