... life is longer than ordinary carriers 8 times, 4, Absolute trackless: without dragging mark, no damage ... to Japanese J I S standard B8723 regulations:4, Trundles: Add 3 times of rated pressure ... minutes, trundle stents should no deformation, rotation axis and guild shaft should no clearance and loose ... In rated load condition, covered 10 kilometers with 4 kilometers per hour, the caster wheel rubber ...