I've got the opportunity to buy a beautiful VenDog Metropolitan cart at a screaming good deal. The only thing I'm hesitant about is the fresh water tank. It's all sealed up inside the top storage hutch. That worries me a bit, as I cannot get to the fitting if it ever started to leak, or if I wanted to install an on-demand water pump, without taking the entire hutch off the cart. Does anyone have any experience with these carts?