There was not enough clearance between the housing of the trailer hitch and the shaft of the trailer ball mount assembly. Purchased this product a little over three months ago. 5 street shoes and got a 12 W size and these fit perfectly. These headphones are perfect if you like a lot of bass. Están muy bonitas. Both use a small black box that plugs into the speakers, but there is no amplifier so its just a quiet tin-sounding headache. It is perfect for storing a few towels and bath necessities for guests as well as providing a seat when getting dressed. Recived non working earphones seal is also opened would recommend if you open your cars! Ordered a 10W, but a 9 1/2 W would have fit better in length.