I have 4000lbs of fasteners that I want to put on a rolling "flat". I have tons of pine 2x6. The dimensions would be 3'x8'. The platform is 3/4" plywood. I have four wheels that can handle that capacity (one in each corner). Would anyone please offer suggestions on framing this? How many planks to run lengthwise (8') to support such weight?
I would frame it like a heavy-duty wall. Each side beam needs to support 2000 lbs. I calculate that three 2 x 6's are required on each side.
16 inch spacing of joists should be sufficient, use 12" to be more conservative.
And if you want it to be really strong, put plywood on both sides.
And I agree with Ecnerwal's comment, this thing will be a dangerous beast.