Ok, this is a quick thing to try, and I will be amazed if you are not amazed. Zero toe in gives great steer tire wear, but it will make the coach hunt like a coon dog.
Set the toe in at 2/32. If you don't like it, it is easily set back to zero. If you think that's a lot, I looked up Prevost specs once, they say 1/8 to 1/4.
If you don't know how to do this yourself, let me know, and I will walk you through it. It's an hour project at best.
All of the coaches I have had handled a little worse while towing a car. They are more sensitive to oversteering with a tail wagging back there.
I know exactly what you mean about the steering box being too tight. It is really hard to distinquish that driving sympton from it being too loose.
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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