It's not an aircraft or pressure vessel but still carry around a car or a pick up truck on public road. The DOT here are pretty picky on frame mods of commercial vehicule.
Different area different rules.
The vehicle is NOT a commercial vehicle. It's not used for commercial towing, only repo work. The capacity is only 3500 lbs. On most 'commercial trucks' the frames are heat treated and I won't weld on them This is a whole different ball game.