On our trailer there is a model ID sticker on the outside driver side front, about knee high. If you don't have that, email or call Jayco, and they will give you the codes for your VIN number, as previous poster said.
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.