If you find such a frame myself and a thousand others will chip in $10 apiece and give you a $10,000 reward.
1980 chevy silverado 1/2 ton thats what i used on mine but i took 8 inches outta the frame wheres the 10,000
If you call fabbing cab mounts, bed mounts, core support mounts and changing from in back of the axle steering to in front, " little or no modification" you deserve it. Taking 8" out of a frame is a biggy for a guy that probably doesn't own a torch or a welder.