I bought these to attach to my truck hitch. It took about an hour to fully assemble the first time. Ditch the included wrenches and just use a set of sockets. For those asking, yes you can only use it for two bikes as it is modular. All you have to do is loosen 2 screws to remove half of the device. It's much easier to store, take off and put back on if you do it anyway. We have 4 bikes, size XL, 24", 20" and low entry. It was a bit difficult to assemble all 4 bikes but I managed it. It just needs a lot of small adjustments. YMMV depending on the size of your bikes. Definitely more difficult when you have several kids bikes and a low step through bike. Be sure to take a photo of the order you set up the bikes so that you remember to do it best next time. I also highly recommend using velcro on the wheels and frame in case there is a catastrophic failure anywhere on a long trip. Overall it was about half the price of some big brands and it works great for me.
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