How heavy is the KHC rack? I would imagine +3 would be a better option as you're around 200lbs already. I would imagine the rack weighs another 50lbs to put you at the 300lb area that it seems manufacturers recommend +3/HD springs.
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Because I carry what you describe plus 5-10 gallons of gas and family stuff I went with +3 Deavers. Better to have them for my use because I would like to do some runs where 2 spares and more stuff may be needed. Plus the extra will help out towing.