[ChiefRocka]

I built one of these before, using an 8' F@rd bed I got for free.

I didn't have the cab back chassis of the truck, so I built one out of 2x3 tubing.

One thing I can add, to keep in mind is tongue weight in relation to axle location.

You dont want too light of a tongue as this will give you an unsafe 'dog-tail' on the road, when empty or not loaded properly.

Typically a bed trailer like this will tip back and sit on its rear end with the tongue up in the air. Although it's light to lift onto the hitch, its not the best weight distribution.