Boswell is off I-40/I-24 at Feslers Lane.
Bost is off I-40 west right next to the interstate
Coolsprings is off I-65 south at Coolsprings Mall, you get mall traffic
Columbia is off I-65 south at Columbia about 30 miles spouth of Nashville. All are easy to get to, I can't say a lot of difference between any of them.
Really it is personal perference, I've not been able to deal on bikes with Boswell, Coolsprings or Bumpus.
Tennessee needs your tax dollars so I would got get something from all of them.

 

Boswells is the best. Bought my bike there. Columbia is closest to my house, I have had decent luck there.

 

i agree boswells is the best. columbia is a brand new building. got an oil change there once because i didnt want to fool with it at home that day.

if ya ever go down the natchez trace, fosters harley in florence (tuscumbia, al) is the best in north alabama in my opinion. great prices and home owned too.