Contrary to what Honda's literature says you CAN install and use TWO inside bike attachments with the driver side armrest accessory in place. I find the two inch space between the wide arm rest and the front passenger seat will easily allow the rear tire of a second bicycle to slide between them. The only problem, and it is a minor one, is that a passenger will be unable to use the full length of the arm rest while the second bicycle is in place. The bicycles mounted inside are rock steady while driving, and more secure that the spare tire mount I used on my Jeep Wrangler. I LOVE my Galapagos Turtle.