Yes, on our 2004 29RLTS, it is located behind a very thin plywood panel at the rear of the basement compartment. That is directly below the fuse panel, which is in the wall at the entrance door. You may have to remove some screws to get the wooden plywood panel to swing toward the front and expose the converter and other electrical components. If you don't find it there, email Jayco, and they can send you a diagram of locations of all the electrical components.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.