Actually this isn't a wardrobe mod, but the addition of oodles of hanging space in the bedroom area. For long trips we found the 2 small bedside wardrobes to be inadequate. Once we get a couple of jackets in there it would be full. And Mr. Tweety put shelves into his, so has no hanging space any more. We installed a hanging rod all the way across the foot of the bed, from one side of the trailer to the other. It's anchored in studs at the sides, and with 2 boards on the ceiling that are also in studs. We only hang clothes over the bed, in order to leave the walkway open on the sides. The clothes hang over our feet while we sleep, and provides the added bonus of blocking light from the living area. (ie. the radio, CO detector etc.) I just think of the bedroom as a big walk in closet now

When we're traveling I stretch a bungie cord between the 2 ceiling supports atop the hangers to keep them from falling off.