Hahaha it sounds fun, in a perverse sort of way!
Actually the best thing that I use is Google Images and just find pix of REAL trashy trailers! That will give you ideas as to what details you'll want...old tires, cans, trash, confederate flag in the window haha (no offense, but this subject could be offensive anyway, so just sayin'....real photos will be best....)
Be sure to have muddy pick-up trucks, and cars up on blocks.
Here's one I found by doing a google search for "trailer trash cake". http://www.flickr.com/photos/twopartssugar/3024950511/
Here's another idea from google (no picture): "made his cake with 3 angel food cakes and frosted to look like tires and made a tire stack"
Here's another:
http://maryjanescakes.jimdo.com/special-event-cakes/
There's lots there - just do the google search. Good luck and tell her to post pics when she's done!
3D dentures with a few teeth missing in the front
3D car up on blocks
rusty trailer with Christmas lights still up
10 barefoot children and a barefoot pregnant mom in a lounge chair
duct taped anything
jug of homemade wine
Just take a drive around my neighborhood and you'll be very inspired. LOL
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