It's not so much the weight, though this is a massive factor, rather it's the wieldiness and awkwardness and the sheer size of the bloody things! Plus they just want to tip over because they are leggy and top heavy. You will deffo need a crane!My span is over 8m so ill need the double stacked timber also. We have installed trusses before and did this by hand. My trusses will be 8m span and 3m high. Think they will be 85kg but lifting these ones up might be heavy unless i get another 3 men in for help.