I currently have a set of wore out 30.5x32 R2 on my 2188. I have a 12" spacer between the final drive and square steel tube. I was thinking of putting 20.8x38 R2 duals on it for stability on my steep hill farms and the price of future tire replacement may be cheaper as well. I haven't checked prices of 30.5 R2 or 20.8 R2. About how much for the dual wheels and hardware can I expect to spend?