I'm using a SF with the RR. You can close the doors pretty well, blocking wind and trapping heat.
You'll have a good sized opening near the top where the triange sus. comes out. Proaly 4-5"
wide. About a foot longer tarp would get you past this issue, isnt the CB longer?
Side benefit to the RR, it sits back in under the tarp further. But.... if windy enough the rains gonna get in.
Found a pic (friends RR) showing coverage.