Effective complaining about mobile home problems requires knowledge.
You have to know exactly what the problem is and who is responsible for it. Look through How Your Home Was Built and then go to the mobile home Setup post to see exactly who all the players are. Once you know that you will be able to stop the blame shifting that is such a very popular way to avoid responsibility.
Put things in writing and keep good records of who you called, when, what was said, who you were talking to, etc. Be aware of dates when warranties end.
Some mobile home manufacturers know they have problems with particular items (for example, faucets) and will keep fixing ones that fail until the warranty expires, knowing that what they really need to do is replace all the faucets.