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@lae
Yeah I know. Bolts and rivets are heavier, weaker and more flexible than welding. The reason why mass produced trailers are attached with fasteners is speed of production/labour/tooling costs (i.e. it's cheaper to pay an untrained labourer with a rivet gun than a buy welding robot or pay a professional manual welder) and, if bolts are used rather than rivets, dismantleability.