I just finished doing our M.H. a couple of Months ago.
My tank holds 100 gallons of water so when I sanitize it I connect my water hose up to the inlet to the M.H. tank but be sure to drain the tank and when it's empty close off the drain spicket and before you connect the hose to the water faucet you pour into your end of the hose 1cup of house hold bleach (use a funnel if you need to) then connect your end to the faucet and turn on the water let it fill your tank,
then turn off the water and then turn on your pump to run it through your lines. When you can smell it coming out of your faucets, let it stand for an hour or so then you can drain your tank and you may need to refill it a couple of times to get the smell out of the water coming through your faucets. When you refill it be sure and run the water through you lines again.
Note: If you can not drain your hot water heater then be sure and turn on the hot water faucets also along with the bath room & the toilet.
I hope this will give you some idea as to what to do.
It may be a good idea to do this when you are at a Camp Ground because you will be able to dump your tanks when your through.
If you have any of your paper work on the M.H. it should tell you the same thing. (thats where I got my info.).
Just a thougt.