Not much is known of BTS besides thier latest claim to fame, their "BTS-03 G1 Prime Matrix set"
they are, however, relatively new, so hey.
They may or may not be related to Best Toys, who made the other Classics-style trailer for Classics Optimus Prime, as they have made an add-on kit for that product, with a new Teletraan/Crane, guns for Drag Strip and Tankor, and hitch attachments for Classics Rodimus, and two Animated Optimus figures.