NCSG Crane & Heavy Haul Corp. has agreed to buy B&G Crane Holdings Inc. The seller is The Sterling Group LP. Financial terms weren't announced. New Orleans-based B&G supplies operated and maintained crane services, specialized rigging, and heavy haul transportation in the states of Louisiana and Texas. NCSG is backed TriWest Capital Partners, Alberta Teachers' Retirement Fund and NCA Partners. Stifel was financial advisor to NCSG while RBC Capital Markets advised B&G.