We are currently at Rialta Heaven waiting for a cooler install. It's a bit pricier than what I expected but mostly due to labor. Quoted at just under $500.
I decided to go with this cooler since we have already had shifting issues 2x while driving through hills and am hoping this will eliminate future problems.
BTW - I asked a local VW dealer for recommendations and they mentioned a local RV dealer/shop. You may want to contact your local VW dealer and see what they say. They may even do it themselves.