Back in 1975, I partnered in a 1970 Skylane. We put about 1300 hours on it before trading it for a new TR182 in 1979, which we kept for about 7 years before my pard insisted on trading for a new T210 in 1986. Without looking in my logbooks, I'd guess that I had about 6-700 hours in the straight 182 and another 6-700 hours in the TR182. Both of the 182 variants were taken into gravel and grass strips by both of us.
However, neither of us took them into really rough areas. Bumpy, yes, rough, no. Both of us were aware of the reputation of a relatively weak nose gear in the straight 182 and relatively weak mains on the TR182. As a consequence, neither airplane was ever structurally damaged.
In addition, I've flown a number of other 182s, also into similar strips, and I did some instruction in various models of 182s.
A couple of years ago, just before I retired, I was involved in a lawsuit involving a 182, in which its nose gear had been structurally damaged a couple of times during its life, and it hadn't been properly repaired. Because of that, I learned a whole more than I ever knew about 182s in general--actually all legacy Cessna fixed gear singles.
Here's what I learned: 172s, 177s, and 182s share similar issues, because the nose gear structure is directly attached to the firewall. 206s and 207s have materially stronger nose gear, because it doesn't rely on the firewall for its attachment. If a firewall is damaged in the 100 series, it will take around $15-20,000 or so to repair/replace, mostly due to labor. If the damage extends to the tunnel behind the firewall, add another $8-9000. In either case, getting parts in a timely fashion has become more problematic--one of my friends waited 13 months for his Cessna-provided 177 firewall to arrive after being ordered by his IA.
How have most of these damaged 172s and 182s suffered their damage? Surprisingly, my research was that it hasn't been on rough strips. Most of it has been on paved strips or pretty smooth unpaved strips, caused by PIOs, often caused by too high approach speeds and the pilot's attempt to plant the airplane when it's floating. It doesn't take much PIO before the nose gear is damaged, even if the pilot doesn't lose it altogether and run off the runway, and even if the nose gear doesn't actually collapse.
My feeling, from both my experience in the airplane and from my research, is that if the pilot flies the airplane properly, it can handle relatively bumpy strips without fear of damage. If the pilot doesn't fly it properly, it can be damaged without much effort. I think Motoadve's videos and experience bears that out.
Cary