I own 2 Taylorcraft Ranch Wagons and let me tell you , that would be overkill Big Time. The spars are overkill for the Ranch Wagon ,let alone a cub ! The front spar is wood and is 2x6. The rear is just a tad smaller at maybe 2x5. They could have been half that size and still have been sufficent ! Gross weight of the ranch Wagon is 2950 lbs. Way too big for a cub ! John