Sorry dude, I can't use the search function for some reason. I don't use brown sugar in the rub because it tends to burn easily. It's better to slather a little BBQ sauce on them at the end. Other than that, just use a little of each of your favorite seasonings.
For a stock out of the box sweet rub, you might want to give Adkins Western Style Barbecue Seasoning a try. It's pretty sweet tasting. It was given to me to try from a friend in Dallas, Tx. www.adkinsbbq.com My personal favorites are Tony Chachere's Creole Seasoning or Zatarain's Creole Seasoning. As a side note, you can sweeten up the Creole Seasoning with a spritz of apple juice before foiling.