10 points! I need some help?
yes, the fire extinguisher does not know the difference between a house and a warehouse. The only thing that matters is what type of extinguisher it is. Most are a dry chemical in powder form and they are used to smother the flames. There are extinguishers that use carbon dioxide to put out the flame and you do not want to use those in your home. Extinguishers for warehouses are typically a little larger than household ones, but they will put out the fire just the same.
Sounds like the Airmatic suspension system is gone on it. The most common problem is a bad air suspension pump but it could also be bad shocks, accumulator(s), valve(s) and/or lines. You'll have to have a shop or dealer that is familiar with the air suspension in your car diagnose it properly for you. This is not something that can be diagnosed over the 'net.