The Vortex Aero crossbar system is going to add about 3-1/2" - 4" to the height of your 2022 Hyundai Kona on tp of those factory rails. Here are the parts you'll need for this system:
49" Vortex Aero Crossbars - # RRVA126B-2
RCL Legs - # RRRCL4
Rear Wedges - # RRSUB0671
RCP Fit Kit - # RR66QJ
If you let me know what you plan on using the roof rack for I'd be more than happy to make any other recommendations you might need! view full answer...
To add a hitch to your 2023 Hyundai Kona, I recommend the Draw-Tite Trailer Hitch item # DT52GR you were looking at. This hitch is custom fit for the Electric models and bolts to your Hyundai with included hardware. This hitch having a 2" receiver will give you the most options and capacity for bike racks. view full answer...
The Thule Sidekick Roof Mounted Cargo Carrier Box # TH78GC uses a U-Bolt # TH02943 that is 3-3/16" wide. I have included an image below with the measurements for this U-bolt. view full answer...
The Draw-Tite Max-Fram Trailer Hitch Receiver # DT52GR referenced in your question weighs just 26 pounds. This Class 3 hitch is confirmed to fit your 2018 Hyundai Kona and will mount to existing holes in its frame for a no-drill installation.
I have attached the installation instructions that you can check out as well. view full answer...
According to Saris, their # SA805BL Bones 2-bike trunk mount rack can accommodate 2 bikes weighing up to 35 lbs each. Even though the total weight of the two bikes you're wanting to carry won't exceed the capacity of the rack, having a bike weighing 45 lbs would place stresses on the rack that it wasn't engineered to withstand and could cause the rack to fail. The same would hold true for the # SA803 as well.
An alternative option would be to install a Class 3 hitch like the Draw-Tite... view full answer...