I'm getting ready to start a trailer build and am researching the part and pieces I will need. Since this is going to be a simple small teardrop style trailer I would like to combine the hot water heater and the furnace to save on space and weight. From the preliminary online research I've done the only unit available that does both is a diesel Webasto Dual Top RHA-100. Has anyone used this product before? Are there any products that you would recommend? I'm not to worried about fuel type, LP gas or diesel but electric is not an option. Is trying to combine these units an unnecessary plan or a good idea? This is my first trailer build so any and all input/advice would be greatly appreciated!