Looking for the air line desicate filter on a 2007 fleetwood bounder diesel pusher, Fleetwood says its on the driver side just past axle. If it is its in steath mode!!! Any ideas......
When you find it, copy down the make and model number.
And a very good option, particularly if the dryer is OE/15 years old if you are not real mechanical is to just replace it with a factory (as in the factory that made it, not a Chinese "made to replace" complete air dryer).
It will come with not only new desiccant filter(s), but new valves, new heater, etc.