That is kind of hard to say before the coach is assembled.
For example.. In my coach the black tank, is,,, of course,, under the toilet (In my case the toilet in the half bath) the master fuse panel for the house is in a short hallway.. on the wall shared with the self same half bath so it is less than six feet from the wall less than 10 feet of 10ga wire was used to hook up the pump.
On the other hand I have seen the fuse panel 20 feet from the dump valve.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times