Have a yr 2000, 4300 HST, 430 FEL, R4 tires. Moved and now have to work on steeper ground. Reversing R4 only add 1.25 inches to tread width. A set of R1's, 11.2 x 24 with wheels is $2900. Manual says should be 6 position and go up to 54 inches center tread, 16 inches from min of 38. I am...