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.
Yes
About $26 at Home Depot for a 3/4" regulator
I would purchase a Watt water pressure guage from your local home improvement or hardware store and check your water pressure at your faucet. If water pressure is greater than 40-45psi your regulator needs to be turned down where the water comes into the house.
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.
you might depending on how big of a service meter you have,if not you can change the pressure demand valve or pressure regulator depending on whats in your home. actually, increasing the size of the meter (and perhaps the water service line from the main to the home) will provide more flow. The pressure won't change unless there's some sort of regulator as mentioned above. If the static pressure (with no water running on the service) is good and decreases markedly when you run water (that'd be dynamic pressure) you might see an improvement by upsizing the meter and service line. If the static pressure is low and there are no pressure regulators in the line you're sort of stuck with what the utility is providing, unless there's a problem on their end. Where we are the state only requires 20 psi at the meter - if your home is upslope or distant from the meter it may cause difficulties.
It could be high water pressure. Try to borrow or rent a water pressure gauge from a home center in your area. If it's high water pressure you can get a pressure regulator. If it's not high pressure (150# constant or surge) than maybe it is high temperature (210degrees). After that comes bad luck.
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.
This is due to the pressure regulator in your home that allows the flow to go to the point where it start to come back and stops sending water unit the flow loses pressure. This is the same thing with all your water outlets, like your washing machine, sinks, toilets ETC.
The presser foot is a special part of the machine that holds the fabric down so the stitches remain even. I have not seen a pressure regulator on a home sewing machine.
An easy way to check your water pressure is to install a gauge using an ice making line kit tapped into an easy spot like under the sink. Just put the gauge on the end of the ice maker line.