Why not do both, the tour pack and saddlebags along with the trailer hitch? My FLHTC has both and as far as mileage is concerned, I once removed the tour pack and saddlebags and it made no difference. The trailer reduced the mileage from about 40 -48 mpg down to about 27 mpg at 75-80 mph but I use the trailer more with my smart than the bike, it doesn't hurt the mileage behind the car because it helps to fill in the turbulant wake.
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