Greg,
I would agree that for serious off-roading, the Rancho's aren't the best choice. I melted my RS9000X's in Baja. I bought them for sway control of my heavy slide-in and for that purpose, I have yet to see anything better. I wish there was because Rancho makes me mad with thier out of date catalog and website.
The Monroe/Rancho thing is an urban legend passed down from parts people trying to sell Monroe shocks. Did you know Ford owns Cummins? The same parent company owns both Monroe and Rancho and at one point there was a shock in both brands that was the same. It was an entry level shock (1000 series, I believe) and is no longer made. The 9000 series is designed in house by Rancho and isn't available under any other brand name. More information is available on the Rancho website under the FAQ's should anybody want more detailed information. I sold Monroe products for 4 years.
Dave