In Northland and in the city of Bayonne especially there is a huge number of people who do nothing but scrap and salvage things to make a living. They're often, but not always, slum dwellers. Often they live amidst refugees in the shanty towns that dot the city. While not a desirable profession these people are rarely looked down upon. In fact middle class people will often pay these scavengers to haul away large bulky items they want to get rid of.
Not all use horse drawn wagons. Many use old pickup trucks, hand carts, and three wheeled cargo bikes and motorcycles.