I saw a few posts about Wheel Alignment numbers. This is from the Hyundai service webside HMA

WHEEL ALIGNMENT [/align]Front Camber 0 deg +/- 30'[/align]Rear Camber -0deg 30' +/-30'[/align]Caster Front to Ground 4 Deg50' +/-45'[/align]Caster Front to Body 5deg 3'[/align]Front Toe-in 0+/-2mm (0+/- 0.0787)[/align]Rear Toe-in 2 +/- 2mm or (0.0787 +/-0.0787 inch)[/align]front King pin angle 9 deg 27'[/align]Perhaps the Caster could make them Shimmy if this seems to be a common problem. Like a grocery cart does. [/align][/align]