This is my first attempt at a flatbed. I started this a moth ago and it was pretty simple to build. Iused tamiya tandem axel assy and plastic landing gear from their trailer kits. I bolted the axels to the rails so that I get a lot of articulation.
 It's pretty strong too... Hauled a real semi truck battery on it with no issues. 
Need to make an icc bar for the rear and weather the deck. 
Thanks for looking.