Man-a-fre used to import them from Austrailia in the late 90s, early 2000, They fit over the fender well insideI did the pvc shower on the roof for a while. It’s a cool concept, but I don’t like having that much weight up top. I want to install a reservoir beneath the truck with a heat exchanger in the engine bay and an electric shower pump. I haven’t really thought too deeply about it, though I know it’s totally possible. Especially on a 60 series.