Somewhere out there one of the sewingware vendors has a vid of a raft caught in a hole in Cataract. It continues until the frame rips free. Then a message comes up 'need new straps?'. It's sick and twisted manipulation. After I watched it twice I switched to doubled 1 1/2" straps with an added middle d-ring on both sides.
Good points. Maybe that middle side D-ring is looking more attractive? Definitely will beef up to 1.5 straps for the raft frame. I do recall that one of my friends uses the larger straps on his frame. On my catarafts the 1 inch straps were ok, since there's like a thousand of them on each tube.What you need to remember is that when and if your raft is upside down, your frame and all your gear is hanging from four little cam straps.
My 16' NRS cat has four d-rings on the outside and four on the inside of each tube, The reason is perfectly clear when you lose one of the three chambers in a tube. If you have straps on each of the four d-rings, you can still run with a deflated chamber. Imagine four straps holding your frame to your raft with one chamber unusable. Imagine two dead chambers. For this reason, I run two straps off each middle d-ring attached to the frame allowing me to still run with four out of six chambers, regardless of which chamber is flat.