Like you, I'm still looking, and only see one FR3 floorplan in the same length range as Axis/Vegas; and the one thing that jumps out is that the wheelbase is 158 versus 188 inches. I'd be far more concerned about that difference (pro and con), and also the FR3's front axle with leaf springs versus the Axis/Vegas' Twin I-Beam with coil springs.
Obviously the FR3 is a heavier-duty chassis, but may ride a little more like a truck. And one would have to guess fuel economy would be significantly lower too. Compared to the somewhat similar 25.3, it does look much roomier though.
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