We've enjoyed ours as well. It's really pretty simple. Look at the back of your water heater and close the valves going into and out of it..should be red and blue and the valve handles go across the lines (should be opposite of what it is now) and open the line connecting the two. Unscrew the bolt at the bottom of the water heater and drain it...that'll be the anode rod you're removing and it will corrode over time and need to be replaced (I get 2-3 seasons on one). It's a 1-1/16" socket to remove it. Replace it with a 3/4" plug that you can pick up from Lowe's or similar. Other than that, on the side of your water pump with the strainer / filter, the line will split. One direction goes to the antifreeze inlet on the side of the trailer. Point the valve handle towards that line if it has one valve and, if it has two valves, open the one for that line and close the other. Continue as Turbs said.
2012 Chevy Tahoe LTZ - HD tow package
2017 Rockwood 2703WS Emerald Edition