Not off to a great start

Scroll to the bottom and there is a video for the 2025 RPod 171. I can't imagine that there are many changes. Also, look under the refrigerator for the power panel. There should be a flip-down cover on it that will give you access to the fuses and breakers.

As for the bathroom fan, there should be two push-buttons on one corner on the same side as the knob that raises/lowers the lid. One turns the fan on and controls speed, and the other turns it off. That is, if the fan is the same model that is shown in the video.

As for the furnace, do you have a full propane tank and is the valve turned on? Does the stove light? And just in case it was not explained to you, the tankless heater runs on the principle that water flow is required before the water heater will start heating water. There is no tank, so there is no hot water stored. It is on-demand.

The dealer should have done a much better job of showing you the features of the trailer and how to make it work. I don't know about some of the issues such as the cargo light(s). There must be a switch on the light fixture in there or a switch somewhere that controls them. If you are not too far from the dealer, I would recommend going back there and having the issues fixed and/or them doing a proper job of showing you the trailer.

Other than that, welcome and congratulations on your new R-Pod. I hope you have many fun adventures and make many great memories with it.