Thor Super C (Chateau/Four Winds) improvements and mods

I just completed a 550 mile round trip this last weekend. I listened carefully to the drivetrain and the only potential sound I hear is when the truck gets up to speed, then downshifts...is it that humming sound (almost squeaky type sound) you guys are referring to? Just curious what the drive train sound you are referring to? It all sounds normal to me...just want to get it fixed if it is a problem....especially if it improves the ride. Thanks.