Stopping Vibration from Walmart trucks

I read in the local paper where  homeowners were complaining about the noise pollution from the local Walmart, especially the late night delivery’s.   Walmart solved the problem by making a high earthen wall inside the buffer zone separating the property. No more noise and very happy home owners now. 

Thanks for ALL the ideas.

 I know the trucks are not allowed to idle for longer than 5 minutes in my city, which they seem to ignore, but the only time I notice the problem is around 9:00 pm, on various odd days. On the first night when I was doing investigating and after discussing with night manager, the noise became intermittent, so I will try talking to the main store manager.

My hope with something like Bass Traps, was that since along the walls there is no problem, I could somehow get the nodes in the center of the room to cancel each other. Also, I was thinking it would be the only way to get bass traps in my living room, sorta two bird, one stone.:)

We have been discussing moving to a different city, farther away from the city. I guess it is time to decide.

 Move out off the grid and go solar for energy and outhouse for other necessities.

Maybe I will just listen to Brian Eno between 9:00 and 11:00pm.

Add a Glass wall to the outside fence. Plastic? Plexiglass? Clearly the old fence stopedd the problem. SO I say go back to the fence as the cure. Notto tear down the new one. but perhaps you can add something to SOME of the areas like a plexiglass shield. (make it portable at first) so you can move them say ten feet) around. and find the spot which STOPS the noise in the house.I have to say in my apartment, placing insulation, just plastic bubble wrap like mylar coated? stopped the endless (depending on the direction of the wind) train nighttime noises in the bed room. I only covered part of the bedroom window inside the outer glass, and between some. SO half still allows light. It stopped 100% of the night time (distant, only if the wind was toward my place) train noise for me. So another way might be to dampen the GLASS with a transparent sheet of material stuck to the glass in some areas? Are your window glass double? double glaze? or single pane? MOST of the noise is coming in via the glass. IMO. And yes it was blocked by your old fence. You could even make a hinged or folding barrier.. Up at night, down in day in the yard next to the fence.
Finally try a roll of plastic film. To test the idea of the fence thing. Roll of plastic material stretched across along the fence. Covering the ’holes’ in the fence with an actual barrier. Thin/temporary yes, but to SEE if it works, perfect. If you want to really be cheap. cardboard.. and packing tape...