Don, as Alan suggests, you can use most any sound deadening material available -- I used left over material from my boat. About our Duck: before buying our motorhome we we're shopping for a newer, larger yacht to replace our 40 foot trawler. In the end we chose to go RVing for a few years. The boat my wife has always wanted is called the Diesel Duck, so she named our Unity "Duckin' Out!". I found the image on the Internet, licensed it, and sent the file to a graphics shop that specializes in making boat names. The whole project cost a couple hundred bucks. We're currently on a year-long circumnavigation of the continental US...presently near Minneapolis and on our sway to Nova Scotia and coastal Maine.
Thanks. I've had our Unity for almost a year and have been frustrated by that blank rear panel. Recently our daughter, a music director, suggested we get a graphic with a snippet of musical score for "Merrily, we roll along..." Only those who read music would "get it"
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If your circumnavigation gets you to Florida, and if you happen to cross the state north of Lake Okeechobee on state road 70, you'll pass our house. Give me a yell and stop by...I have 30A electric and good water hookups and my "home made" dump station, on 7-1/2 acres, so there is no problem with space...
We were near Whidbey Island on our own cross country trip in 2011, coming from British Columbia, but of course one does not causally "drive by". Ours was only 4 months, but we did New England and north a different time. That was in our LTV Free Spirit van, which was fantastic, but also led to us up-sizing to the Unity IB.