I consider myself handy with an allen wrench, and have done more than my fair share of Ikea assembly. The Kuat Sherpa 2.0 tested my every nerve though in trying to get it assembled.
For your own sanity, ignore the assembly video on their site, and pour yourself a beer and give yourself an hour. The included instructions are directionally correct, but missing a few steps.
What the instructions don't show for example, but becomes common sense after 20 minutes of cursing, is that there's a plate to screw the bolts into. You just have to line it up with the bolts, and then they're fine. I had a huge challenge with the 'rear tray bolt,' so make sure that you have a hammer with you to help ease it in place.
Ditto for the 'hitch bolt.'
All in all, I'm pretty disapointed that a product which is so expensive could be so challenging to assembly. Poor job.