This is a boat trailer that we turned into a flatbed with composite decking. It's 14'5" x 6' and heavy due to the composite decking. We brought it to the lake 3 years in a row to use as a deck for the camper, then used it to haul things.
It has been sitting in the garage for the last 5 years as I no longer have a vehicle for pulling. It's been a big storage shelf, so I do need to get rid of the wood on it. The tires still seem good. For sure, one of the light kits is broken. It's very solid. The composite decking is extremely durable.