stretching the rope just helps take the elasticity out of the line by tightening the weave of the rope. In general, spectra lines don't need this since they don't stretch enough to notice. since poly-E lines aren't woven as tightly and stretch more, stretching them between two cars will help make them less springy. People do this all the time for slalom ropes. Usually you aren't really putting that much force on the ropes. Ususually nothing more than 100 lbs. If you want, you can get a fishing scale from any sports store to see how much pressure you're applying to the rope.
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