On the other side (ods) side of your RV there should be a door for def behind the tag axle. At least that's how it is on the 2017 Entegra Insignia. Just like you have a fuel door on the ODS side of the RV.
Wow that's crazy, what was Entegra thinking eh? To be honest, I always just buy the 2.5gal bottles and fill it with those in our 2017 Insignia. We normally try to get it at Sam's club. @@Thenewgoldenboy
