Let me put it this way:
I've used 2 Crank-2's with a 15-foot truss made from ADJ i-beam trussing. On it were a Sunray III, Mystic, Vertigo, Double Twist, Trilogy, Reflext, Rover, Electra, Barrel Flex, an Aviator SP-8 8-channel dimmer/switcher page, 2 PP-DMX20L's, 8" mirror ball with motor and 4 Par36's. Went up and down just fine and seemed OK. I'm fairly sure I was below the weight restrictions.
Free-standing. Load as best as I could do by eyeball evenly distributed.
The DuraTruss is much more rigid. Regardless, I wouldn't feel comforttable throwing up 150 pounds/stand with the Crank-2, no matter how much I like this stand. Anything over 100 pounds, I want a medium duty stand. The Crank-2 is definately what I'd call a light duty stand.
I mainly use this stand for a 10-foot truss(also made from ADJ i-beam trussing). Typical load is a PP-DMX20L, a Mystic, the Sunray III and a Vertigo. I'm gonna chuck some additional stuff up there next event.
Sorry, not a math major, can't work out thte load factors for ya. Let's hope support jumps in and spells it out for us.
