Not sure if you meant 5 inch stumps or 5 foot stumps.
Pine and Fir trees have long root systems but are very shallow and run just under the surface along the ground (pretty easy to uproot and push over) and are not deep rooted like hardwood trees in the midwest. (At least in the Pacific Northwest and Northern Rockies)
I have properties in both places.
For my evergreens in Northwest Montana I am able to use my 1944 John Deere 420 crawler ~ that boasts a 2 cylinder gasoline engine and push over anything 2 feet diameter or less in 1-10 minutes. Anything bigger and drill some holes and fill with diesel a few times and burn them out, or if I'm in a hurry or want to have a little fun with it, auger bit and a fuse and special ingredients...
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