You might be needing around an 8". I don't really remember how low those trailers ride to the ground but I bet it's not close to level with your 2" drop. They are probably running on small 14" wheels and little tires so your drop needed might be more than you think.
Just use your trailer jack and set the trailer at even, where it should run. Back the truck up to it and measure from the top of your ball you have on there now to the top of the tongue where the ball connects. This should give you a rough idea of how much more drop to buy.
You already have 2" of drop and if the measurement is, say, a little over 5" or so, you would get an 8" drop.
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