I removed the strut today, took it to the dealer and swapped for the replacement. The number on the new strut is "310", same as the one I removed.
I installed the new strut but unfortunately it's no different than the one I removed. If anything, it might be a little worse. So I'm back where I started. Very frustrating.
At this point I'm going to leave everything alone until the spring. Maybe the performance of the strut is affected by the cold weather? Hopefully when it warms up again the strut will hold the awning up. We shall see.
2015 Cedar Creek 34RL
2014 Ram 3500 CC 4x4 6.5 Bed Cummins