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Official USPS trucks are right steer, to put the driver on the same side of the car as the mailboxes on a normal street

No - there's a surprising number of "classic" British cars that are kicking about the US as collectables.

https://www.beverlyhillscarclub.com/1964-rolls-royce-silver-...

Interestingly a mate back in the 90s used to g to the US from Australia and ship back container loads of classic British cars and car parts sourced cheap in the US at a time when that fad was on the wane there and bargains could be had that sold for a good markup in Australia.

Mail delivery trucks have the steering wheel on the right side so that the driver doesn't have to get out in order to reach the mailbox. When using normal cars, they're modifying the routes slightly.