Place tofu block between paper towels on a plate. Set another plate on top, and put a weight on top of the plate such as a can to press the water from the block of tofu while you prepare the sauce.
In a medium bowl, stir together the soy sauce, maple syrup, liquid smoke, garlic powder, black pepper, barbeque sauce and brown sugar until smooth.
Slice tofu into 1/4 inch thick slices, and dip them in the sauce to coat. Place in a tightly sealed container. Place in the refrigerator, and let marinate for one to two hours.
Preheat the oven to the lowest temperature, around 200 degrees F (95 degrees C). Line the oven rack with heavy duty aluminum foil, and place in the lowest position of the oven. Place the tofu slices on the foil.
Bake for about 8 hours, checking and turning over tofu slices every few hours. Tofu jerky is done when it is hard and uniformly dark in color.