My Rubberduck UCP is 1" SOLID STEEL. Trust me when I said it's tough as hell cause I had a hell of a time trying to straigthened it (using Drty's method of turning it upside down on a 4x4 and driving over it). I drove over it at least 10x, and when I put it back on, I got MAYBE 1/4" clearance.
Btw, this was the first time I had to straightened it after numerous wheeling including 2 John Bull trails (where rock
THUMPS! is a constant event
) in over 20K miles.
It fell off on Golden Spike because the mounting holes on the factory frame are crap (PhilD can confirm), and I lost most of the factory bolts; though I'm sure the weight of the Rubberduck is a contributing factor (mustta weigh at least 5x the stock tubes). On his suggestion, I ended up re-taping all of em to a larger diameter bolt.
I understand H20's design is superior because it protects a much wider area (whereas the Rubberduck is almost just a beefier replacement), and simply top of the line quality.