[JP1738]

Can someone explain to me what exactly this is? A friend of mine informed me that I'll likely be a designated pair at this weekend's national in Charlotte. He said that they typically consist of the bottom 3 qualifiers and their opponents. I can't find anything on NHRA Racer about it and wanted to know more and what to expect should I be included in it. I've qualified last or next to last at every divisional I've been to so far this year and I don't think that's going to change this weekend.