1987 was a particularly good year for D2 at the D1 tournament. Besides Haselrig, Tim Wright of SIUE (then D2) and Roger Singleton of Grand Valley State both placed at 118 and Darryl Pope and Eric Mittlestead both placed for CSUB (then D2) at 177 and 190, respectively.
I was at Penn when the decision to exclude D2 and D3 from all D1 championships was made in the early 1990s. (I believe T&F and other individual athletes were allowed to "compete up".) I remember a lot of hand-wringing about the sanctity of each division's championships. IMO, the quality of D2 and D3 wrestling has declined as a result as high-level athletes who preferred to attend D2 or D3 schools for whatever reason (campus size, proximity to home, academic program, etc.) have been "forced" to compete D1.