Slader's Raider I was a Vee-Kir 4 Bulk Transport owned and operated by Roark Slader. It was modified to allow the DP20 frigate Slader's Raider II to be concealed in the bow.
Sources
"The Pentastar Alignment" — Star Wars Adventure Journal 3 (reprinted in Classic Adventures: Volume Four — The Best of the Journal) (First appearance)