I've done most everything I can think of, but I haven't added on board water yet. I'd like to have a Little Giant pump like: Little Giant Pump, Utility, Nickel-Plated Brass, 12 VDC 365 | Zoro.com and have it connected to a quick disconnect showerhead on the roof rack. Trying to find a water bladder that would be appropriate to fit in the right rear quarter panel. Has anyone done this? Is there one you'd recommend? Heat element too?