Question: Once you have a reservation number after you make your refundable deposit, can you continue to make ongoing "deposits" to your reservation number? So for example, put $1,000 down and continue to build up your down payment for the vehicle?
Why let Tesla hold onto the money interest-free for so long? Just give them the $1000 then build up your down payment amount in an account that is at least earning some interest (as small a rate as that might be).
That way if you decide for some reason later down the line that this isn't going to work out (maybe an unexpected emergency happens), you won't have to wait to get back your $$ from Tesla.