Tuga, it sounds like you are OK without the upgrade.
My coach came with 11R24.5 tires all around. Because I fill the enormous bays in my coach with 'stuff' since I live in my coach, I had a front tire loading problem. At Newell's recommendation, I switched to 305/75R24.5 tires on the front only. When it is time to replace the front tires due to age, I will move them to the tag and buy new ones. I will likely do that at about 4 years.
With the new quad slide Newell's putting so much weight on their front tires, Newell recommends moving the steer axle tires to the tag axle every three years and putting on new steer axle tires.
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