I have yet to bring our fat bikes anywhere by car with a new Curt 18085 bike rack we picked up for two reasons:

1. We need to pick up the tensioning strap that takes some bounce out of the rack
2. The rack has padded arms that hold the frame and I’m concerned about potential frame rub

To fix #1, I’ll pick up Curt’s recommended 18050 strap. For #2, the cheapest workaround may be to identify what part on the bike frame will contact the rack’s padded arm, clean the bike frame’s identified area, and then place a frame sticker/piece of packing tape on the identified frame area before loading it into the rack. Fortunately, I’ve got a bunch of large frame stickers that I picked up cheap on eBay that I can burn for this task. I’ll report back on how it works in the wild.

** Update 7-21-2021 ** The frame stickers work great and this rack has been outstanding. Even better, this rack accommodates my Surly Big Dummy, a double-bonus I hadn’t anticipated!