It is better for us to choose a spigot truss manufacture with different certifications.
Customs will ask for certifications sometimes and the events organizer will ask for it.
Especially the 12 inch aluminum square box truss,you must make sure the loading capacity is safe enough.
Or you cant bear a fall down truss in your business life.
Shizhan Group with CE TUV SGS and some patent certifications for some products.