Here's my first instructable. I wanted to build something easy for my kids for Christmas and found a couple of interesting ideas on different websites. The blue background photo is kind of what I wanted to replicate but I wanted to kind of make it my own so here is what I ended up with.
I didn't want to spend a whole lot of money on this so I used mostly things that I had laying around namely some 2 x 4's and some screws and a piece of scrap 3/4" for the wheels. Tools used were scroll saw a belt sander and drill with large hole bits. Later I found that the cars may slide off the trailer so I added little dowels to hold them in place and to use to connect the front of the semi truck to the trailer.