As for the light shroud issue, I think there should be something like a collapsible shroud built around two metal hoops that slide around the poles which would expand and collapse with the truss. The bottom segment below the lower ring would have a velcro-sealing opening through which you could place the plastic cap to seal the bottom of the tube. That way you wouldn't ever have to remove the light shroud. You could attach it one time (hinges on the hoops, threading through velcro loops on the inside of the shroud, the aforementioned velcro opening all the way up and down, attaching to the tube with velcro tabs on the inside of the shroud and on the rims of the tube segments?) and never have to take it off.