Michael
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Sign us up for the chili contest.
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Here is my 2 cents and it is at best a sense of what is going on compared to having positive data I can point to.
Each of my coaches drove and tracked very well. Each however required some minor steering inputs to cope with the crown of the highway or the affect of air when passing large vehicles. Each coach required less steering effort (an 87, 97 and now an 06) which I attribute to continuous improvement from Prevost engineering.
The 97 had 315 all around and tracked well, but on my first drive with the 06 which had 365 tag and steers I sensed a significant improvement in how it tracked. Unfortunately I cannot determine if it is the result of the IFS or the tires or the combination. It just tracks much better.
But while the 365 tires may contribute they have a downside. If you have a failure on the road, they might be difficult to find so you are going to end up with an odd size tire likely mounted on the tag to get you to a tire shop or home. The same may be true regarding a 315 but less of a problem. If a 315 fails there are other sizes that can be run on the coach that will carry you through until you need a new set of tires.
The 365 may make for a smoother ride. I just know my seat of the pants senses aren’t good enough to detect or measure that. I do know they are loud. Not so much while driving on smooth roads, but when crossing expansion joints they seem to transmit a louder ringing noise compared to the 315.
And this is just a personal observation regarding tires and axle weights……if the converter built a coach whose axle weights exceeded the Prevost limits and the limits of the tires. replacing the tires is not going to help all the other suspension parts that are overstressed. It may make some difference, but it will not erase the problem which is excess weight.
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It may be a weak breaker or when the fan motor heats up it is drawing too much current which means a new motor for the fan or can possibly be re built. Next time you run it see if you can hear the fan change pitch or sound different than it does when starting from being completely cold.