A notch is required for a 4/6 on a NBS, and you will want assist bags if you have an extra cab and carry passenger or anything in the bed. On an NNBS you can get away with a 4/5 comfortably without a notch. I went from a 4/7 to 4/5 on my NNBS because I didn't want to notch it. Going to put assist bags on it again soon.
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