I answered this on the Jayco forum. Even replied to your PM. Pull the panel off the cabinet below the cabinet door that accesses the water heater. It's right there. Accessing the fuse box is across the trailer by the stove, and offers nothing.
2019 Ford F-150 Lariat Supercrew. 5–/2 foot bed. 3.0L Powerstroke,
Loaded. 2020 K-Z Connect SE 241BHKSE