Sprint, a 1992 is an old trailer. What make and model is it? Also, does this trailer have a hot water heater and what kind of pipe does it use (Pex)?
To answer you question in general, though...
If you are talking about sanitizing the fresh water tanks, drain the fresh water tank of any water, then refill halfway with clean, fresh water.
Mix 1/4 cup of household bleach for every 15 gallons of tank capacity in a container with a gallon or two of clean water.
Pour this mixture into the fresh water tank.
Top off the water tank with fresh water. Drive the rig around the block to mix the solution.
Pump water through each faucet in the kitchen, bath and outside shower if it has one so that all the lines are filled with the water/bleach. Might as well look for leaks at this time while you are at it.
Assuming this has a hot water heater, the hot-water tank could hold 6-10 gallons of water. Run the hot-water faucets until this much solution has passed to insure that the old water has been purged from the hot-water tank, and it is now filled with the water/bleach solution from the water tank.
Let the water stand for several hours.
Drain the entire water system including the hot-water tank.
If you want to remove the bleach odor, mix 1/2 cup of baking soda with a gallon of water and pour into the freshwater tank. Fill again with fresh water. Run faucets and drain again.
DW, 3 Kids and our Goldens
2012 Shamrock 233S
2008 Toyota Sequoia 5.7L 4WD