Richard,

You need to call a fence company and pay them just pull out the posts for you.
Couldn't be that expensive and less strain on your old back for sure.

They have a wench set up and they'll pull them out of the ground in about 5 seconds with that thing.

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Rick Hurst_Home Works Inspection Co_Rockwall TX
In the words of Mike Tyson.... "Everyone has a plan until they get hit inda mouf"