Why buy 5 tires?

[Haydel-H3]

Hey tell me the truth will it screw up differential?

I drive 100 miles a day and go through tires like water, feels like it.
Only had one flat in 10 years of driving. Even driving off road.

If I buy 33" toyo's and have a 32" spare, would it be just like running on a low tire with the 32?


Is it worth Paying an extra $300

Explain the way the rear or front differential works on the H3.
Does the front and back have limited slip clutch plates?

I have the H3 non locker rear.