We use 7/16 inch 3ply polypropylene, 200ft long, eye splice in each end. Weak links are 1/4 inch 3ply polypropylene, eye splice in each end, one eye splice holds the appropriate tow ring. Slip the eye splices together on each end of the heavier rope.

Auto tow ropes are 5/16 inch 3ply polypropylene, normally 3 600ft lengths with inline splice, for 1800ft length, eye splice on each end.
Add appropriate weak links.

Any solo student should be able to make a weak link in 10 minutes or less.
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BillT