Whether the San Francisco 49ers trade up in the draft to take a receiver will be a topic leading up to the May 8-10 draft.The 49ers are expected to have 12 draft picks and may have six in the first three rounds depending on their compensatory pick, which is expected to be dispersed in March. Receiver is the 49ers' top need. Considering the 49ers moved up from No. 31 to No. 18 to take safety Eric Reid last year and the fact that Reid made the Pro Bowl as a rookie, the 49ers may be more than willing to make a big trade up.