Bracing wires, or a V brace are required to stabilize the fuselage when floats are installed on any Cessna. Many Cessnas on wheels should also have this bracing, as cracks are developing in the lower doorpost structure because of undesired motion in the fuselage. V bracing is more common, though quite inferior to bracing wires. The V brace carries loads from each forward wing attaching point to the top of the glare shield, which really is not adequate to carry these loads, and the V braces commonly works loose, and is of reduced usefulness, and difficult repair. The bracing wires go from the wing attach point to the opposing upper engine mount, so carry the loads between two suitably strong structural points. Bracing wires were common in the earliest 180/185's - which had all the radios just above your knees. Once Cessna went to center stack radios, the bracing wires crossed behind the instrument panel, exactly where they wanted to put a few radios - so the inferior V brace. For the 182 in the videos, I had to break the news to the new owner that he could not have the audio panel at the top of the radio stack, as it would hit the bracing wires. Once that went down, I was able to install the GTN 750 at the top, as it has a high, but shallow display, and the long part of that radio is low, so it passed under the bracing wires, and made for a very nice installation.