Rear end feels wobbly lose

[06xl]

When driven at slow speeds maybe 5-10 mph my rear end feels like it's wobbling example if I stop completely an just let go of the brakes no gas my keys, air fresheners all passengers start to shake an truck feels weird even if on a level paved road But once I pick up speed around 10-15 it goes away uany ideas suggestions

 

[TnTahoe]

possible bent rim???

 

[06xl]

I have factories 17 i guess that's sumthn I should check out