had the same concerns you do about a single point attachment for the 5th wheel hitch.
The "single point" is the exact single point for the gooseneck ball. I have no concern, having pulled a 30' heavy gooseneck trailer and my 9,000 5th wheel several thousand miles.
There are actually hard rubber pads on the four corners of the Companion 5th Wheel that contact the floor of the bed. But since there is no movement of the Companion 5th Wheel, they just sit there.
I have pulled with a RBW Lil' Rocker and a Pullrite SuperGlide. I have to say without any reservation, the Companion 5th Wheel has absolutely NO movement compared to those two.
And a good flat black paint applied to the parts that clamp to the frame makes a nice looking installation.
B&W stands behind their product too. They replaced a Companion 5th Wheel for me, no charge, freight paid, that had the powder coat peeling off. And they did all from pictures I sent them.
A couple of things they should add is a spring to hold the 5th wheel plate level (it's heavy to the front edge) and move the latch closing lever lock pin a little closer to the edge. It's hard to reach that lock pin when it is dangling by it's chain on a 4x4 and I am almost 6' tall.