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Doubling over splits the elasticity that reduces peak impact force. If you had 50 legs, it would be like a thick, steel cable.

And, you can anchor the truck to a tree or others secure it. A parking brake is only for two tires. When I used my truck as a retainer line anchor, I wedged the brake pedal with a cut-to-length round of wood with truck running.

Maybe you mean a HD z-rig.

A Maasdam rope puller has much more MA than a Z-rig, with progress capture built-in, and may be cheaper. A bit heavier.

I've broken one old, old rope on a hard pull on a log off a spar in a no-risk situation. Log just sat back onto the spar. Another rope pulled it off. Working solo, nobody in the tree. 5-6 years ago.

Where did 1/2" break? Midline, at the tree, at the truck?

Rope angle and 4wd affect traction and load to the rope. Momentum/ dynamic versus steady, more-static pulling affects peak force. Rope Elasticity affects peak force.

When in doubt or trying to keep forces lower, consider a Double Whip Tackle with a strategically placed block or rings.