I don't know what this sound is if it's something loose or what, but when I hit my back wheels it makes this noise but it doesn't make the noise on the front wheels.
https://vimeo.com/1170443571?fl=pl&fe=sh
if anyone can identify the sound from the video and tell me what it could be, that would be very helpful.

 

Assuming your lugs are tight, get the car in the air and start investigating. It could be suspension or brake related.

 

That kind of sound from the back wheels often points to worn bushings or loose suspension components. On older trucks and cars, trailing arm bushings or shock mounts can make a clunk when the rear wheels hit bumps. I’d start by checking the rear control arms and shock absorbers for play.