I've had no problem Supercharging with my cargo rack installed. It's a cheap one from Harbor Freight that was originally for 1.25" receivers, so I modified it for 2" receivers and also raised it about 3.5" in the process.
I see now that was a little confusing combining all the files together like that. I have added 2 zip files grouping them together and also updated the description on Thingiverse to be more clear. Thanks.