I just did an on-line chat with Renogy re my situation. The reply was that they would not recommend installing a lithium battery in the camper without a DC-DC charger.? My original avoidance of wanting to do this is that some of these converters require a wire connected to the tow vehicle ignition switch and I did not want to run an additional wire thru my vehicle to do this.? However, I found out that Victron makes a charger that does not require this.? So, I guess my next question would be has anyone used this type of charger and how and where did you install it?