As somebody wrote, strops are not the right thing to use in towing. Rope has more give and will not risk pulling out jate rings or eyes. As a tow eye whistled past my ear and through the windscreen I realised KERR rope is`nt a good idea either. 40mm three strand polypropaline will pull a truck but give enough to allow you to get the clutch out,
Dyneema, the new wonder rope has less give than wire, most tugs using it put in a nylon stretcher to absorb shock loading. oh, poly is cheap as chips from a rope manufacturer, me.