It is not the motor mounts
The sounds of banging and servants bells ringing
CV Joints
Banging a guitar will render it inoperable.
Sounds like you need new struts.
Sounds like a weak ground connection somewhere on the trailer or tow vehicle.
It sounds like another form of "Pulling ones Pud".
POSSIBLY India arie - heart of the matter. i don't think it sounds techno personally so like it MAY be the wrong one but that song IS in the trailer :) x
It sounds like a grand funk railroad song
u joint or my be the trannie mount. but sounds more like the u joint
Check your sway bar rubbers in the front, there are 4 of them and they will cause a bumping and banging noise around corners and over bumps.
get a new trany or rebildit cuz its going out unless the knocking is from moter it might be timing
Sounds like you're talking about a trailer.