Look in the Freightliner Chassis Owners manual - Or look online for your specific chassis/engine model's online manual. You want to find details on the Information Display Center
You have a Freightliner Maxium 34,320lb chassis,
Your RV is really two separate things - a Freightliner chassis and a house built by Winnebago upon that chassis.
This is a long shot, but James, AZ Expert on YouTube did a 2010 Freightliner display - maybe it will apply to you (maybe it won't):
__________________ 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA. "We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln