We picked up our new 8244WS two weeks ago and just got home last night. Our trailer was ordered in February, arrived at the dealer's lot three weeks ago, and we picked it up a week later. So, it did not sit on a dealer's lot for months--it is brand new and just off the assembly line in March.
It has exactly the same problem with the IRC radio volume control. The only way we were able to endure using the excessive volume on our trip was to listen to the bedroom speakers while sitting in the living room. Otherwise, we would have missed the final game of the Final Four because the volume is so loud it would have deafened us to use the living room speakers. We also used it with the HDMI cable to play a video from our laptop, but could do it only by using the speakers on the TV and not the radio.
So, it may take a while to "filter down" the fix, but it had not filtered down to the Rockwood factory by March 2015!
New: 2016 Rockwood Signature Ultra Lite 8244WS 5th Wheel
2015 Ram 2500 CC-SB 6.7L Cummins turbodiesel 4x4
Sold: 2012 Rockwood Mini Lite 2109S