Flatbed equipment choices....

3/8 is what I would get. I only used 1/2" chains on the big stuff and had to keep them in my box on my trailer because the hooks were to big for my chain rack. A 20ft 1/2 inch chain weighs a ton.

In these picks this motor weighed over 80,000 and was top heavy. I used three 1/2" 10ft chains to tie down the bottom on each side and two 1/2" 20ft chains on each end. Most of the engines I hauled were smaller but I hauled two of these. Any open deck load is fun to haul, just the challenge of tying down these loads make it interesting. Who want's a job where they close two doors what fun is that.

 

No need to buy bungee straps, the roads are littered with 'em.

 

Get a headache rack with a tarp tray on top.

 

Thats a good lookin Star Car. Know you just need a shiny aluminum flat with a whole bunch of lights on it.

 

Then put them in a trailer box. Doesn't look like you have a lot of rail room for a box big enough to store tarps. I know I can fit 2 8' lumber, 1 20' x 16' steel, 1 12'x 12' smoke, and 1 11' x 8' utility tarp in a 60"x24"x18" box under my step. There is no more room after all that though.

 

Looks like you could take the step box off the passenger side and put a full box there. Or take the steps off and the big tank, and put a tank with steps there with another short tank behind the stack giving you room for a bigger box on the frame. It's kinda hard with the stack right through the middle there.

You might have to just strap the tarps down on the trailer and save up for a nice custom cabinet.