Hi
@MTN Ranger, welcome to the forum. The Rivian delivery vans do share quite a bit with the R1S and R1T. From a motor trend article earlier this year.
What's in the box.
www.motortrend.com
Skateboard Chassis
The Prime vans will share their basic electrical and network architecture, ECUs, and battery packs with the Rivian R1 models. Its basic single-motor e-axle drive units come from the entry-level Rivian R1 products. But there's enough difference between these skateboards that they will be assembled on their own line, separate from the R1. The body build and final assembly will also occur on a separate "low-feature-content" assembly line, though common body and paint shops will handle both.