The SEER SSR-1400US is a UL-certified (UL 583:2023) slim reach truck autonomous forklift configured for the US market with a 1.4-ton rated load capacity and 500 mm load center distance. It measures 2,190 by 1,192 by 2,228 mm and weighs 2,060 kg with 1,600 or 3,000 mm standard lift height, 1,480 mm minimum turning radius, and adjustable fork width from 400 to 700 mm on 1,220 by 122 by 40 mm forks. AI deep learning recognizes pallets, racks, and cages in various specifications with multi-angle adaptive high-precision recognition. A 24 V 210 Ah lithium iron phosphate battery provides 8-hour endurance with 2.5-hour charging. Speed is 1.2 m/s full load and 1.5 m/s no load with ±10 mm and ±0.5-degree positioning accuracy supporting SLAM, reflector, and NFL navigation. The 1,184 mm body width handles narrow aisles with a 1,384 mm minimum aisle width, supporting up to 3 meters of stacking and handling closed and open pallets with mast reach forward. Three SICK NanoScan3 HV LiDARs provide navigation and safety. Right-angle stacking aisle widths are 2,260 and 2,220 mm plus 200 mm. Braking distance is under 50 cm at 1 m/s and under 72 cm at 1.5 m/s. Standard features include E-stop, sound and light indicator, 360-degree laser protection, bumper strip, fork height protection, and HMI display. ISO 3691-4, EMC, UN38.3, and RED certified. Customization includes fork width, overall height, color, and logo. Targets industrial warehouse and logistics narrow-aisle rack access for the US market.