I used to work at a sawmill and they look like the trolleys they loaded the timber on for moving it into and out of the drying kilns - except for the bow in them - the ones I have seen before are straight.

I wanna see ya do this:

[www.flickr.com]

I think it may be an optical illusion that they are bowed influenced by the overhead wires and the bow in the trailer.

big trailers are always bowed up to accommodate a downward bend from weight.

I know that, I was talking about...

... oh fucking nevermind.

Boys! Go to your rooms!

"guess the mysterious objects...": A truck!

Tow truck platforms.

Unloaded theses 'moffie carts' today...they were used to load pipes onto/into ships...the guy that signed my bill of lading in Vancouver, WA today told me that he was the one that stacked them up, 17 years ago, in the storage lot where I picked them up them up at Long Beach, CA,
Couldnt find anything on the googletron about them..

Um, well a moffie is what we would call Fossil in Australia.
[www.urbandictionary.com]
And a moffett is known as a dog, a truck mounted fork or crane.