I was just thinking trades wouldn't benifit that much. We have trucks and cranes and stuff.

What construction material weighs 100kg? All the stuff is made to be installed by a guy or two. Big stuff is hoisted with cranes, heavy concrete is pumped. A sheet of plywood is carried by one man, a cement block gets plopped 2 feet from where it needs installed one by one, doors and windows are a one man show.