Mobile Home Plumbing RepairsA manufactured home plumbing system is a more simplified version of a stick-built home, but that simplicity is not a bad thing, those differences makes everything much more accessible and easier to work on.
Some manufacturers may have used the lightest, and often the cheapest plastic piping or galvanized metal, so replacement will be needed eventually in older homes. Galvanized pipe is known for rust issues and and the plastic piping (polybutylene) are known to corrode and cause leaks. There’s also issue with the connections. If you find yourself plagued with leaks, go ahead and re-pipe the home, if possible. In the end it will be far cheaper, and less stressful, than trying to fight with old material and patches. Area plumbing codes will be the ultimate factor in deciding what material to use but Pex seems to be a well received product, as long as the connections are high quality and a proper seal is made.