Preheat broiler. Place rack so that pork will be about 4 - 6 inches from the flame. ( Or you could grill)Meanwhile, butterfly your tenderloin. Do not cut all the way through!Cover with plastic wrap and pound with a mallet or rolling pin - dont use the teeth on your mallet - until about a 1/4 inch thick.Mix dressing and cranberries together in a bowl. Sprinkle inside of meat with half of salt, pepper and brown sugar. Spread dressing mix in a thin layer ( thinner than what you see here). Make sure to leave about an inch around the edges.Starting at the short end, roll the pork up fairly tight. Some stuffing will fall out, thats okay. With kitchen twine tie the roll up so that it looks something like this. Make sure you keep the seam side down and that the meat roll is secur. Sprinkle and rub with remaining seasonings and sugar.Spray broiler pan lightly with cooking spray and place tenderloin under broiler. Cook until done, rotating often. Cooking times will vary. This one took about 30 minutes, but it was a pretty big tenderloin. Use a digital thermometer if you have one. Shove it into the middle of the roast and cook until at least 150 -155. Let it rest for 5 -10 minutes before slicing.