I'm looking to buy a small ztr to mow my 2.5 acre yard, slightly rolling with a couple of slopes that are probably at 15 degrees. I'm looking at a used super mini z 25/52 in good shape with only a few hundred hours. The only downside is that this is a 2003 model, with 20" rear tires. I'm also looking at a newer 19/52 mini with the 23" tires. I really like the idea of the bigger engine and hydros of the super mini due to the sloping ground. Would I see a difference in traction between the two? I'm guessing the super would also ride a little rougher due to the smaller tires, but I figure the suspension seat would help compensate for that. Any thoughts?