You are thinking of two different things.
1. Any trailer must have at least 10% of its total weight on the hitch, in order to prevent sway. TM's go for 14-15%, and so are almost sway-proof. This means that when you put your "stuff" in the TM, you can put some of it towards the rear, as long as you also put some ahead of the wheels to maintain the 14-15% balance.
2. In your truck bed, you can put weight anywhere. It is reasonable to put it as far forward as possible, to reduce weight on the rear suspension. Realistically, though, truck beds are more or less centered over the rear axle, so your ability to change the weight on the rear axle, simply by moving cargo around, is quite limited.
Bill
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