Depending on your floor plan, they usually locate it under the rear bed. UNLESS you have a full wall slideout on the drivers side. If your 12 volt fuses and 120 breakers are mounted onto the base of the rear bed, then the Converter is located there under the bed. You have to remove the wood panel covers after you lift up the bed. I don't believe any of the gas and towable Jayco's have a compatible Converter for Lithiums. Believe it or not, the Hi end Airstream Trailers do not have compatible Converters for Lithium(at least 2020 and older). Their Touring Coaches do. You just re program the Inverter/Charger on the Touring Coaches. We had quite a few of our Airstream owners try to swap in Lithiums and they failed within 6 months and NO WARRANTY from the Lithium Makers due to incompatibility of the Converter and Inverter/Charger systems. The customer then had to buy upgraded Lithium compatible Converters and then buy new Lithiums. Expensive lesson. Doug