I've got a Rola for sale. I highly recommend it, and not just because I'm selling one lol. The only reason I'm selling is because I switched to a hitch rack. I hate not being able to go through the drive-thru car wash with the rack up there. I did it a few times and it was fine, but I didn't want to keep risking it.
The Rola is super solid and adds zero wind noise. I didn't notice any difference in mpg either.