IIRC the 454 in the 1995 Suburban made 230 hp and 385 lb-ft of torque when it was new. So yeah, not a lot of power for something that big and heavy, especially turning those big tires and with the aero drag of a small barn. Single digit mileage too.
Even a bone stock 2005 Cummins at 325 hp/610 lb ft would be a better…