While heat is a product of fuel and time, recognize that charcoal isn't the only facture of fuel; oxygen is as well. One chimney starter is well enough to exceed 400-500 degrees with enough ventilation, though, the duration will be decreased. I mention this because you need to make sure that you have enough ventilation to draw air into the charcoal stoking the fire to your desired temperature. You can dump 2 bags of coals in the firebox but if air can't reach the burning embers, your temperatures will actually go down.
Things like baskets and blower fans can be used to increase flow to your fuel sources and thereby increase your temperatures. A basket allows your ash to fall away from the heat source and reduces choking. A blower increases the amount of air that can be drawn in to the system which increases temperatures. Be careful though, most smokers are designed for a natural draw. If you pump too much air in there, you can gen an inferno on your hands pretty quick.