Thanks, I do more of expedition type wheeling than strictly rock crawling, so I needed somethingthat would carry all the gear I usually bring, as well as spare parts.
The truck weighs 4400lbs as it sits now, title weight is 3640(IIRC), I would guess there is about 250-300lbs in the flatbed itself, not including the safari rack.
I used 1-5/8"x .125" round tube.