What year/model do you have and what year chassis, or are you still looking?
Best one going for the chassis.
The Sprinter forum is broken down by chassis type, T1N, NCV3, and VS30..... which is up thru 2006 CHASSIS, 2007 to 2018 CHASSIS and 2019 and up CHASSIS, respectively. There is also a motorhome sub forum on there.
There is a View/Navion forum of some sort on Facebook, I do not do FB so I have no idea about it except that I understand it is quite active.
The "original" View/Navion forum was founded when the first ones were introduced. It was on Yahoo and they shut down all of the groups, so the entire contents of the three groups were skimmed and transfered to iO.
The three forums are the basic discussion one, the technical one, and the modifications one.
You will need to join all three of them. It is not a forum like iRV2, somewhat different format, but lots of helpful people and useful information, you will spend a lot of time learning how to navigate the photo albums and databases in addition to the discussions. I still look at them some, even though I have sold the View.