I would recommend doing all of the work yourself with help from us here on the forum.
By doing the work you will learn and in the future if you have a problem you will have an understanding of how things work and be able to resolve most issues.
It is not rocket science.
Think about it.
For example: the fresh water plumbing. The shower, the sinks and the water heater all need a hot and cold water pipe connection. The toilet only needs cold water. The water pump only needs cold water. The city water connection is cold water connection. While there are a multitude of ways to connect each device to it's respective hot and or cold source. Just sit down with a piece of paper draw two parallel lines from left to right. One at the top of the page one at the bottom. The draw symbols of the sinks, shower, water heater, toilet etc. in the center of the page.
Designate the line on the top of the page as cold water and the one at the bottom as hot. Then connect the devices to the appropriate line(s).
You should know that the pump draws water from the onboard fresh water tank thru a small device with a screen inside. The pump discharge is connect to the cold water piping. It really doesn't matter at what point in the line. The same goes for the city water connection. Do the research on pressure regulators a pressure relief valve which only go to the cold side of the system. They can be built in or external. The pressure relief devices are only in the city water inlet piping not the in house pump piping. By looking at the floor plan of your coach you should be able to determine the routing of the water lines. It is sometimes easy to get crossed up with the hot and cold resulting in things like hot water going to the toilet. PEX tubing is sold in red and blue colors. Use red for hot and blue for cold. Thus eliminating the chance of crossing things up.
The electrical system is more complicated thus requiring more caution and education. There are several web sites like "The
12 volt side of life" where you can go to educate yourself.
There is a thread from back in 2010 and 2011 by "lucymcdog " where members of the forum helped a person with absolutely no electrical experience completely wire a mid 60's A$. It's a long read but worth every minute of time. This person did the plumbing as well. Along with many other projects required in the renovation.
Ask questions;
Get answers;
Make a decision based on those answers.
AND GO FOR IT!!!!
We are here and happy to help.
Good Luck
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