I found this trailer on a remote-control trucks. Bought it and just using the trailer. It come with rubber wheel, transformer sticker, and the back can be open. Like i did the one before- using ultimate prime's trailer... Nothing special on this, jus basically the same mod done. -blue led all the way for the trailer's side -rear red brake lights -custom peg to fit with optimus -easy accessible 2xaa size battery pack with cover Size comparison picture, longer than 2 deluxe class.