Very steep and somewhat narrow, with some very tight hairpin curves between Alamogordo and Cloudcroft. Once you are past Cloudcroft, it is mostly downhill to Artesia. Between those two towns, the road is merely winding, with a few slightly steeper downgrades. The scenery is great and, it you have time to stop overnight in Cloudcroft, don't miss the drive out to Sunspot (preferably without the trailer). There you can tour the National Solar Observatory and take in the view of the entire Tularosa Basin, all the way out to White Sands and Organ Mountains National Monuments.
I have a short 5th wheel, so am not sure how difficult it would be with a 40-ft. 5th wheel. But motorhomes, semi-trailer trucks, and logging trucks seem to make it, so I would think you could too.
"Retirement is the best job I ever had!"
2015 RAM 2500 4x4 crewcab 6.7L CTD; 2016 Rockwood Signature UltraLite 5th wheel