Nice to have you onboard with us.
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Find the VIN number. It should be located on your chassis. Contact DMV. They should be able to tell you the year.
It appears to be an older model and identifying it from a picture is going to be very difficult.
Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS