Remove all personal items. Box them and store them out of view. (Pay particular attention to bills, or anything pertaining to the value of the trailer; these should be locked up or moved out of the trailer.) Tidy everything away, make the beds, and leave nothing on counters, tables or other surfaces. Your goal is to make it look like a brand-new trailer, or a model in a show room.
Clean the trailer meticulously from top to bottom, inside and out. You are not cleaning to your usual standards, but to pass a "white glove test" by a prospective buyer. If you need help, hire a cleaning service.
Make sure all garbage is removed. Have the waste water tanks emptied and deodorized, and spray all under-sink surfaces with a deodorizer. One of the first impressions people have of any home or trailer is how it smells. If you have a dog, make sure there is no doggy odor, and keep Spot outside, preferably out of sight and barking distance, during the showing.
In the daytime, open windows or turn on the air conditioner, if feasible. This will also highlight that you have air conditioning in the trailer. At night, turn on all the lights. If your trailer has slide-outs, make sure they are all the way out and stable when your visitors arrive. Your goal is to make the trailer bright and airy, and to look as large as possible.
Add the little touches that make the buyer want to live there. Put a new spread on the bed and fresh flowers in a vase on the dining table; add new soaps and hand towels, perhaps tied with a pretty ribbon, to the bathroom. Make sure the toilet seat is down before you leave the bathroom.
Stage the outside, too -- trailers can have curb appeal. Wash off all surface dirt, clean the deck, make sure the yard is clean and tidy, and add some flowers to the picnic table or hanging baskets to the deck. Your goal is to make the trailer as attractive as possible while remaining neutral, since your taste may be different from others.
