Three piece tramps can be installed with the boat assembled (assuming you have the opening in the middle of your crossbars). The boat has to be fully disassembled to install/remove the two piece tramp. Although even with the three piece, it's still easier to slide the tramp onto the crossbars if you take the boat apart.
The three piece can be made tighter and it also doesn't have that velcro flap that runs across the tramp, so it's a little cleaner. The two piece tramps were only available in vinyl, so if you like a mesh tramp, you're out of luck.
Otherwise, no real reason that I'm aware of that they changed to three piece other than probably just trying to maintain consistency with the tramp design on the other models.
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