Welcome to the JOF.
I know that using the VIN#, Jayco can provide information regarding axles etc. But I don't know how many years back they have access to. You could try calling Jayco first, having your vin# in hand, and see what they can tell you.
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.