The Replacement Shell White Shroud for Penguin and Dometic Air Conditioning Units part # AT3308046006 as the title states is designed for Penguin and Dometic air conditioning units so if this is what you have then yes, it will work for you. That said, I am not sure what type of air conditioning unit you have on your trailer so there would be no way for me to confirm this for you. For reference, the Replacement Shell White Shroud for Penguin and Dometic Air Conditioning Units measures 42"... view full answer...
According to my contact at Coachmen, your 2006 Coachmen Concord Motorhome 255 is 23' 8" long x 7' 9" wide x 10' 3" tall. The storage cover we have that is closest to these dimension is the Adco SFS AquaShed Cover for Class C Motorhome part # 290-52843. The Adco SFS AquaShed Cover fits RV's that are up to 26' long x 8' 6" wide x 9' 3" tall.
As long as you do not have more than 110" from the bottom of the cab to the top of your A/C vent, the cover will extend down the entire side of the... view full answer...