I own a 2007 Fleetwood Revolution motorhome equipped with a Hamsar taillight housing, part number 81120, bn:606706. I am seeking a replacement but have been unsuccessful so far. I am hoping there may be a cross-reference available to a bus or another vehicle. I have attempted to contact Hamsar without success.

The reason for seeking a replacement is that the light has become very dim, possibly due to faded reflective coating. I considered accessing the enclosure to paint the reflective portion, but it is not designed to be disassembled. I also have installed an LED bulb that did help but just not enough.

Alan,  You didn’t  mention if the lens is cloudy like is often seen on automobiles.    Maybe try rubbing with toothpaste and then a thorough cleaning.  I’m sure you  can find more on YouTube

Otherwise, the light assembly is probably sealed to prevent moisture accumulation.