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If you still get the warning lights for low air, you're good. FMCSA only requires that some warning system be operational.
Could be a short in the alarm system, could be that the valve which activates the alarm is stuck, could be because of moisture somewhere in the system... assuming that your air pressure is building up to normal levels, that is.
You could have moisture and contaminants built up in the line or sensor to the warning system. (or it's all frozen if in the winter) Can you hear any air leaks? Is the gauge accurate or is it frozen at a higher reading, does it bleed down fast?Some trucks may not go out until near 70 or 80 pounds it just depends on the system. The main safety issue is the bleed off reading, 60 pounds is the LOWEST pressure the buzzer/lights are supposed to come on.
Air pressure governor needs to be replaced.
If the air bag warning light is on in your gauge cluster, that is indicating a fault with your SRS system (airbag system) Get it checked out.
Behind the dash board.
The air dryer blows out moisture it has collected.
With sound
There is a problem with the air bag system. Until it is fixed the light will remain on. Take it to a garage for repair.
when should crawl space be vented
Who made the chassis doesn't really matter - what does matter is what motor you have in it. IIRC, Itasca RVs were built on Freightliner chassis ranging from the Sprinter 3500 up to the custom built RV chassis from Freightliner Custom Chassis.
You won't find one without the make and model of the engine. Or, you contact a Freightliner dealership with the last 8 digits of your VIN, and they can tell you the part number.