So I picked up in May. Oliver provided sewer hose, drinking water hose, water pressure regulator, sewer elbow to connect to sewer at campsite, lug wrench and power cord. You need a torque wrench for tires and that is not provided. I bought my own water regulator so I can see the pressure and use Oliver one as backup. You will also want chocks and levelers.
I’d highly recommend a tire monitoring system.