I know manufactured homes use different standards . . . My preferred application would be a braided metal over the flex line for both hot and cold using "shark bite" attachments. If not, then I would use flex copper with standard threaded connectors.
I wonder if your entire home is piped with PEX? Their system uses red for hot and blue for cold.
http://www.pexinfo.com/#advantages
Hot water tank flex lines
Linear Mode
