US bike route 21 Atlanta to Chatanooga

[IknowUrider]

Got an awesome tip on another thread to do this route to get safely from Atlanta into Chatanooga, TN.  I'm assuming  terrain won't be much of an issue. So far the map graph doesn't look too brutal.

If you've done this ride , I'd be grateful to hear any recommendations for good services, possible warmshowers host, (I am a member of that, just haven't really used it yet) , hazards, dogs etc.   

I know the section from Summerville ,   is doing a short 59 mile "sport ride" , fully SAG supported etc. so that's comforting that at least a part of this ride  is visible to the general public and they are used to seeing cyclists so that is so huge.

Route:  https://www.google.com/maps/d/viewer?mid=1ngCUrWOdofRHWbrTIlmOVl-hsRY&ll=34.19892020999878%2C-84.94405795922727&z=9

Thanks so much, God Bless.