GMSLLC. Speciallizes in Brokering and Selling of used Construction, Aggeregate, Mining and Farm Equipment. Equipment owners are faced with tough decisions when they need to trade or sell or upgrade their equipment. We can help! If the Big Dealerships arent offering enough money for your trade equipment or if the Big Auction Companies are hitting you with High Sellers Fees, Transportation Costs, Etc. Try us!. We will inspect and represent your equipment through the selling process using our 16 years of experience and contacts in the Industry.