Winter time travel

We have camped in our 2009 Navion during sub-freezing temperatures as we travel four seasons. All the plumbing is inside the motor coach save the holding tanks which have 12Volt heaters. The only issues experienced were frozen dump valves. Hair dryer took care of that. If you have a diesel generator (common on Sprinters) be sure to have the oil appropriate for the season and run it everyday for a bit to ensure that it will start when needed. A small electric heater is good to have to maintain an even heat at night when AC is available and also is good for loading the generator when that is running. Just like a house in the winter, it is essential to keep the living space warm. Your Navion is probably plumbed with PEX pipe, so if a freeze up happens, PEX is somewhat forgiving and not subject to splitting open like rigid plastic or copper.

Time travel is possible not only in Winter. I have had my Navion up to 88 MPH (not advised during windy conditions) passing trucks, but that is not required for time travel. I have observed on numerous cross country trips that time advances when driving West to East and time reverses driving East to West. One time traveling at 75 MPH, I saw my cell phone time advance one hour. The Navion did not have optional Flux Capacitors, only the stock Diesel Particulate Filter and turbo charger and intercooler.