Transplanting spruce trees

[CDNOutdoorsman]

Hi gang, I was wondering what the largest size spruce tree could be to be moved with a tree spade that gives the tree the best chance of survival. I have a few large (15+ foot) spruce in my back yard that I would like to move to the front for more privacy. Im on an average so room isn't an issue, I just wanted to know if these trees would survive. Also when would be a good time to move them if its possible. Its a bit soggy now so I don't want to rut up the yard. Anyone have any experience with moving large spruce? Or is the limiting factor the size of the unit to move them. I would think a payloader with a spade will be needed, don't think a skid steer will be big enough.

thanks for any insight.

CDN