While at the sand show in Costa Mesa Ca, I was shopping for front sand tires. I have rear paddle tires that are 25" and I need a front set of smoothies. I asked a random vendor that was selling paddles for a price on a set of 26" front smoothies. The vendor told me I have to get the same size as the rears because it will put stress on the front diff if I ever run 4 wheel drive. Is that true? I almost never run 4 wheel drive in the dunes but every now and then when I need to climb a tall hill I will kick it over to 4 wheel drive. Do I really need to put 25" fronts on to match my rear 25"s or can I run 26" on the front like I want to?