Enslave someone, Make said slave be a slave and carry the rope.
Thats what i do now. It would be awesome if they made trading with slaves easier, like an alt-click "Pick this up" command and maybe a way to easily drop items too. Slaving is what i enjoy most in the game, just rope weight is annoying...
what if said slave dies? 
Then I am really screwed because i can't carry all the rope to get the slaves i need. So I must go to the car, get 2 rope, get 2 slaves, go back to car, get more rope, give to slaves, get more rope from car, go hunting again and hope slave wont die... see how this could become tedious?