The person on the left is carrying bags, the one in orange is a delivery driver and a couple of people are wearing backpacks. Aside from car brained, Damaris is also blind.
A perk of belonging to my city's bike advocacy group is that you can rent this for no additional charge:
64″ aluminum truss-frame trailer; easily carry a 4×8 sheet of plywood, eight bags of groceries, or whatever else you can fit on it up to 300 lbs; holds 4 plastic tote boxes before stacking
Nosireebob, can't haul stuff around with that... /s
Trying to persuade the (amazingly) only contractors on the entire planet that think they need a tiny-penis truck because they occasionally need to pick up some wood from Howm Deeepo to ride a bike is like trying to get blood from a stone
My dad has a solid bike trailer. It's not as big as your group's one, but he can do about a WinCo shopping cart worth in it. That's plenty for the vast majority of their household needs.