Werks fer me!
i used it to finally prove (at least to myself) that as the SWL of a line goes up(including doubling a line in DWT, 2 seperate lines etc.), so does the loading on the support etc. For SWL and elasticity elements are reciprocal to the same loading force; almost as much as power/speed being reciprocal tradeoff to equal the same force as a product. The elasticity loss, doesn't buffer as much of the direct, immense shock of movement to the support that carries the linked load.
Never taken it outside, to job etc.; but just got inside look at the patterns of loading.
Edit: So that at a standstill; hanging from 1 point; a DWT will decrease the amount of support load from 2/1 X Load with pulley redirect on support for ground control, to 1.5/1 with DWT. Due to the loss of elasticity in the doubled line to the load SWL ratio; the dynamic forces of any non-nominal motion will incur more load on the support. As the SWL of the line tensile to load ratio goes up; the SWL of the support strength to load ratio goes down, with the dynamic forces of movement! The key element being the trade off of SWL to elasticity as equal and opposite reaction per a moving force.