We have used our Vermeer S600 to make some removals like that.
Some pop out real easy and some are tougher. If we have access with a vehicle, we have a 72 F 250 4X4 with a 15000 # winch on it, that if you combine that with the Vermeer, they are coming out real quick.
The trencher idea is good, and we also have a backhoe for ours, so we can hog out a bit and then do a lift and pull thing with them.
You have to be real carefull pulling with a pickup / truck, you can snap a drive line rel easy when jerking.

__________________
Dale Wiley - Owner / Project Manager
Western Sports Turf
Landscape Specialty Services
Wetland Restoration Nursery
Forest Grove, OR
503-357-7202 - Phone
503-359-9294 - Fax
Semper Fi
You know that on Judgement Day, all the gold and silver is gonna melt away ...