Upgrading to a D7 because the ground is tough. Filmed with: Canon VIXIA HF R800 Camcorder Keywords: cummins 12 valve cummins 24 valve cummins 2nd gen cummins 1st gen cummins first gen cummins dodge cummins dodge CAT cat caterpillar caterpillar bulldozer tractor heavy equipment old dozer bulldozer cat bulldozer