Car batteries fail when you least expect them to; they are really fond of Murphy's Law. Without jumpers, you are SOL. With them, you have options.. Jumpers are not just for you - you might run into someone to whom you can give a jump.

I just bought my first standalone battery system. We'll see...

I like a good sturdy tow strap, not a rope. Whatever you use, keep people out of the path of the appliance. I once sacrificed a good climbing rope to tow some guy's RV and we managed to snap it. It was a very spectacular event. With the forces involved, any rope or strap breaking will inflict serious injury to anyone in the way, with or without metal.

Tow chains are very stiff, with no give or elasticity. I have found several times that the elasticity in nylon is beneficial in getting the stuck vessel to more or less "pop out." In a serious situation, you are likely to need both.
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Geezer in Chief