I went to work at 16 y/o as a laborer. Used to use a home made boom truck. I think it was a 2 ton '49 International single axle truck. My uncle fabricated the boom from angle iron etc. First you had to decide whether you were going to lift a heavy load (5,000 pounds) or a lighter load higher in the air. There was a 20' section of boom that had to be removed for the heavy loads. LOL. Shift the PTO into neutral, shift the tranny into reverse, and back the boom tip over the load. Set the parking brake, if it worked, or have someone scotch the wheels. Engage the PTO into reverse, and let off the cluth, the headache ball lowered. When it was in the proper position, simply push in the clutch. Switch the pto into forward to raise the load. Drive VERY carefully, watching for potholes. It even had an LMI system. Whenever the front wheels left the ground, you were overloaded. It was also hard to steer in that condition. It had 240 air conditioning. There were two big gaping holes in the floorboard. About 40 MPH cool air eblew in, along with other road debris, or water during the rains. We were unloading small grain bin packages and metal buildings. I don't think they'd ever heard of a forklift. Before the boom truck, they unloaded everything by hand. That was in 1973. Today we have a forklift, five telehandlers, a 25 ton boom truck, a 35 Grove, a 60 Ton Grove, and a 100 ton Liebherr. They all stay busy for the most part.