If it is truly diamond plate Aluminum, that stuff is heavier than it looks, and with the square footage on the inside, I imagine they have a good amount of weight..
safety certain was not first in thought thats for sure..
The fact that this vehicle has been repeatedly seen on the road is perhaps an indication that it is fully road legal because it would be reasonable to assume that police do pull it over assuming it to be un-roadworthy and/or over weight for the base vehicle's maximum limit!
The driver would have needed to establish beyond doubt that this was indeed roadworthy and within its weight capacity for the base vehicle in order to be allowed to continue on his way!
That truck is at the least a Ford F450 and possibly an F550 (which has a GVW of 19,500 lbs. My 2004 F350 dually had a GVW 0f 11,000 lbs and had a payload capacity of 4500 lbs. Bill C