Normally there will be little weight in the boxes, some tools, Fixaflat , rain gear,etc.
Probably will have either the top box or the ammo cans but not both. Added weight should effect acceleration and not top speed.
I like the 30 tooth because I can stay in a gear longer when I am riding here in the mountains with a lot of curves and altitude changes.

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I still have my trailer shown here hauling garbage to the dump behind my long gone 2010.

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Empty after a dump run behind my 2012.