Take a look at it. If the pump is loose have them secure it. Mine vibrates one whole side of the trailer. It isnt the pump but rather the rigid pex pipe vibrating against the wood panels it passes through. If yours is caused by that there are three ways to address it. 1-add an shurflo accumulator tank to reduce the time the pump runs, 2-add a shurflo pump silencer kit http://www.amazon.com/gp/aw/d/B000WN...pi=SL500_SS115
, or 3-physically isolate the pump/pipes from whatever they are vibrating on using foam, etc.
I tried the pump silencing kit with limited success but then realized it was the pex pipe making all the noise.