Double Leashing

Hi everyone, my husband and I are at our wits end with walking our girl. Sometimes, walks are perfect! Other times, she pulls the entire time. We've tried to vibration collar, treats, gentle leaders, etc. but nothing is more interesting than whatever her nose is picking up.

I've seen other people talking about "double leashing" where they have a hands-free leash attached to a harness and then a regular leash attached to a collar for more control over the dog, but I learned long ago that what works for other dogs does not work for coonhounds, as these stubborn beasts play by separate rules! Has anyone tried double leashing their coonhound and been successful?

Thanks!