I have been pretty open about my experiences with my Sanctuary as I have created a number of videos showcasing the issues I have had and how I have fixed them ... along with other modification to make it better. Like most people, I purchased because of the diesel Mercedes 4X4 platform ... knowing I would face some build quality issues.
My advice, make sure you do a though and complete PDI and do not accept the RV until they have fixed all the bigger issues. You have outline a few issues above ... add these to your list as well.
1) Test the awning! These have really weak motors and many have trouble retracting when fully extended. Let the awning fully extend without anyone pushing the button to stop it before it fully extends. Then try to retract it.
2) Make sure you have the awning manual tool ... you will need this when the awning motor gets stuck.
3) Test drive over 65 MPH and feel for shakes ... the rims/tires are know to be defective from the factory
4) Test all water systems and look for leaks. Common areas are within the water pump cabinet and the exterior cassette toilet access area.
5) Do not forget to get the bluetooth speaker ... often missing.
6) Test the vent fan and listen for rubbing
7). The light bar cloth cover is usually damaged in some way
8) test everything ... as if you were camping including the hot water heater, interior heater, and gas stove.
9) do not forget to test the inverter ... the TV outlet is connected to the inverter
10) Run the generator loaded ... AC and microwave on at the same time.
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