The VIN is stamped on the top of the "A" frame curbside on my 2013 25FB with a decal street side just behind the front section joint to the main body of the trailer. It got hidden on the "A" frame when my Hensley hitch parts were mounted....
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels