I would love a 20-min discussion around the issues that Rivian has with audio. It's rather unbelievable how inconsistent the audio performance is in the same vehicle. Dolby Atmos, played right, borders on acceptable quality for a decent stereo, but then can quickly devolve into some of the worst...
Don't use your trade-in on a lease. It's the same as increasing down payment, which is all money you can easily lose if the vehicle is totaled quickly. You want to pay $0 down on the vehicle to reduce your risk.
With that said - leasing options are pretty poor. You'd be better off going used...
I see lots of people with this same idea; that Rivian is paying close to retail pricing for rentals. I sincerely doubt it as large companies are able to negotiate with rental fleets much more aggressively than you'd imagine.
I know of one contract (from likely a smaller company than Rivian)...