I’d assume 200 per person (a lot lot of people weight more)

Basic possession is 25-50 a person, and if you want to have anything beyond an empty unfurnished trailer bed/batteries/activity gear/food/water is going to start to add up fast.

For me I could easily add 75lb of climbing gear, 50lb of snowboarding. Basic Solar panel is 20, batter another 15 and so on.