Thanks for the video. I'm assembling mine now. It's a 2020 model, but it looks pretty much the same as the 2017 model in your video. I'm connecting the two bottom pieces, and I don't understand the purpose of the four bolts that are supposed to go into the incline rail assembly, as they don't connect to the main frame.
Wish I saw this video earlier, I would’ve called u. I just got mine today and it took about 4hrs to assemble. Also they dropped it off on the sidewalk so I had to get all the parts into my house one by one.