Hook up the water and rinse out all the antifreeze. Make sure you run some water through the water pump so you clear it out as well. Make sure you have the valves turned right on the hot water heater after you get rid of the pink stuff so you have hot water when you turn it on. I also like to pour bleach in my fresh water hose then hook it up to the water, turn it on for a few seconds with all faucets on so that bleach gets into the lines and sits for a few. Might as well sanitize the fresh water tank as well. You can either wait until you get to the campground and dump your grey water since you probably put alot in it through this process, or dump it on the ground, its only fresh water mixed with anitfreeze.
Take time to check out all the appliances and make sure no critters built nests in them.
Not much to it, dont pay the dealer.