With an R-value of 5.2, that thinsulate is better than pink rigid foam. And probably better for sound.
But my plan was to cover pink rigid foam with upholstery fabric and attach it to the walls. Then I do not need any interior paneling. The payload capacity of these vans is relatively small, so weight matters, trying to avoid wood paneling.

 

The rigid foam works better in the BrightDrop than the Sprinters/Transits because the walls are flat. Thinsulate was much better for nooks and crannies.