I have never had a rv like yours. I will tell you what I would to find about what you have.
Let the air out and refill them, try to figure out where the air compressor is by it's sound when running it, I am sure it's 12 volt so you won't have to be plugged in or run the generator for it to come on, All you should need is a charged battery on the rv. The air bags use a 1/4" black plastic tube on most units. Just because it says " you can use the compressor to air up tires" doesn't mean the fittings are already there to do it. When you find the compressor, post a picture.