It gets expensive when you start replacing stuff to find out.
Take a slow drive over the bumps and get a walker to have a listen.....no jokes please
If you get an incline where it coming from then get car up on axle stand and start to pry the joints with bar. Put a big bar under the tyre with a wedge in there and yank it up and down to simulate movement.
They don't always show movement but sometimes with the leverage you can see it. So much rubber to check.
If engine mount is bad then it could allow exhaust knock?