Freshen up the electrical items - no ugly connections, etc. And make sure everything works. Spray any rust spots on frame with Duplicolor rust convertor or a similar product (leaves a black finish). Add fresh coat of light colored paint on interior. Scrub exterior until spotless. These steps will help you sell the trailer quickly at a decent price. The other mods will not return their cost. Painting the tip of the jack with a contrasting color gets you added points beyond its cost (mask with tape for a definitive cut-in line).
