I have a Thor Hurricane 32A with 19.5 inch steel wheels . I was thinking of upgrading to Alcoa aluminum wheels when I replace the tires. Is it worth the added investment? I also noticed Winnebago class A motorhomes of about the same size have 22 inch wheels. Would it be okay to put the larger wheels on my 32A? I know this may require recalibrating the speedometer as a larger diameter tire has the same effect as lowering the gear ratio. Thoughts?