I decided to build a longer flat deck trailer than what is available from Tamiya. I started with their flat deck trailer kit, and then bought some aluminum pieces to make it longer.

Then I made up some suspension parts and bought some airbags from PMD.

The first set up didn't work to well as the trailing arm rubbed the tires, so I had to move it inboard a bit.

The final setup looks like this.

Just about finished now, just painting and finishing the deck left to do.