I have a UDS and i can only put 2 racks of spares on the top rack i was thinking about adding another rack right below the top one just so i can put 2 more racks of ribs on it. So a total of 4 for a smoke. I was wondering if by doing this the top ribs dripping on the bottom ones would that make the rub come off the bottom ones from the drippings? I would just like to have more stuff on the smoker because i tend to do 2 pork shoulders and a rack of ribs on the top usually but if i can add more ribs i would love that. Thanks guys.