Seems we've all had our share of grunt work. Worked in bluestone quarries, cut timber, moved furniture, unloaded box cars, excavation work, standing on top of 3-4 story framed structures setting rafter trusses nearing 40 feet long. Yep, been there. Done that.
You have thrown Semi-Truck tires onto a second level rack. Probably threw about 20 of them onto a rack chest high, including 10 drive tires. You know, the ones with a full inch of tread. Probably about 125lbs worth of tire. Also moved around a brake drum, likely 80+lbs. What heavy stuff do you guys mess with at work?