MrZip,
I purchased my first NEW motorhome last spring and like you, found out the hard way. I fortunately discovered the issue at around 2500 miles so the tires are correcting themselves. I had a rear, larger anti-sway bar and a steering stabilizer installed...thankfully the installer corrected the issue when installing the stabilizer.
As others have pointed out, it is up to the final owner to do this. I fault the dealer for not pointing it out. It needs to be done ASAP after purchase.
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