Hi Lauren,
I have been away from TNTTT for a while. Gladly because I am staying busy with my Build. Sadly because I am STILL busy with my build. We have had a wet, wet winter out here in Seattle, So I am stuck working in the cramped garage. Slow going. I am down to finishing up the galley cabinets and cleaning up some mistakes. I am envious that you went with an off the shelf tongue box. I am still have to build mine. I will be hauling a Solar panel so the tongue box size has to fit.
I did see the map images you posted but couldn't find any explanation. Is it your trip plan? If so. it looks fun.