I-Beam Trolley | Jervis Webb 500 Pounds Capacity. $ 77.90. Select your I-beam trolley from Jervis Webb, the inventors of the modern production line conveyor industry. This I-beam trolley is a 1/4-ton capacity (500 pound) hand pushed trolley and adapts to 3” and 4” I-beams. Order by 3pm for same day shipping.