I came to this thread expecting someone was asking about using a trailer-mounted battery to charge to vehicle while driving. It's good to see the level of intelligence here with Rivian owners vs the Tesla forums I've seen. And yeah, like others have said the 12V in the trailer wiring will...
Possibly but the R1T is currently what's in stock the most and they are pushing to sell. EDV deliveries are truly the money makers, here. Two DHL examples have already been shipped out so we should be a month or two away from a formal announcement of a partnership. DHL would be stupid to pass...
V2 (and V1) used a modified CCS Combo 1 (SAE DCFC) protocol which only Tesla vehicles can understand. They "could" be modified to change their protocol via firmware but they are only 120-150kW and in shared pairs (A/B), which is not ideal for opening up to other OEMs.
To complicate things a...
I used the Mobile Connector (charge cord) that came with my Tesla in 2013, for 10 years with no issues. I used a Leviton 14-50 outlet from Home Depot. The KEY is proper terminal torque, here.
This looks like a nice feature to have, and the functionality is the same used for Tesla Superchargers, so I wonder why Rivian isn't on the list.
https://www.evgo.com/autocharge/
Looks like improperly torqued outlet terminals. One thing that electricians forget to do is to wait a few minutes and then re-torque. The copper or aluminum will deform after the first torque and it will pull away from the contact surfaces. That second torque is very important.
Do what all us Tesla owners do when we are charging and pull in at 90-degrees, blocking off a bunch of spots. Stay with the vehicle in case someone wants to complain or take pictures to shame you on social media.
100% real SoC is usually never achieved, due to preserving the health of the battery. My Tesla has only achieved 99.7% SoC (real) when it's charged to "100%". As it degrades with age, that "100%" could actually be a lower real SoC.