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@Denny16, thanks for the prompt and detailed reply. I have a new 2021 320 BD also, so same tub and construction as Verna, I assume. I plan on sourcing the exact tub as Verna’s since I am not an early adopter/tester kind of person. My spare is mounted just aft of the tub, under the Tab as received from the factory. My TV, a Honda Passport with tow package has a tongue weight rating of 500#. I will be traveling with what I expect to be an “average” to “low average” load of gear and supplies (my previous camping mode was backpacking). Does that tongue capacity sound adequate to you (or others with experience)? Thanks.
Yes, I looked at the key and it says CH751 on it. I take it, therefore that this isn't very secure, as anybody can buy these keys from Amazon! I'm NOT happy with this discovery, but thanks for warning me. I'll see if I can't figure out another way to secure this otherwise nice box. I'll post a picture later; the trailer is stored some miles away from my house.
I got this lockable box for a 100aH Battle Born Lithium battery. I bolted it on to the platform next to the tub (2021 320S): https://torkliftcentral.com/powerarmor-single . There are several vendors; I got mine from e-trailer. Of course, no battery box is 100% theft proof, but this should deter the casual thief.