Yes
All the mobile home water heaters that I've seen are the same as regular house water heaters, -if you can change install one in your house, then you can install one in a Mobile. The actual procedure differs if it's electric or gas and as you don't say which, that's as far as I'll go for now..
Mobile homes that are serviced by city water should have a PRV or Pressure Reduction Valve. This is something that appears to be be the owners decision, as I've seen almost equal numbers with or without. -If a home has PolyB pipe this is a necessity.
IF there is one, it would be where the water is hooked up from the main under the trailer.
50 -55 PSI is perfectly adequate, especially if your mobile is older and uses Poly -B pipe.
Go to Home Depot and get a pressure guage the will screw on your water hose faucet.
YES, most definitely. I have done lots of it.
If you are serviced by a city,you get them to place a waterline into the home. -Otherwise you have a well drilled and buy a well system, pump and pressure tank .
The biggest difference you will find between mobile home water heaters and house water heaters is the the mobile home version is generally slimmer in order to fit in the smaller spaces in a mobile home. The installation is also different as the mobile home heater feeds from the bottom and vents from the bottom.
The Clean Water Company install water purification systems for home use. They're known worldwide for their water filter, which they install into both homes and businesses throughout Ireland.
Install mobile code without confirmation
Codes vary, check max. press. allowed in home, if press. higher than allowed by code coming into home, than install pressure red. valve.