Take a look at the image below. There is some major reinforcements in the roof in the B-Pillar area. Robotic YAG laser welders put the cab cage together with continuous seam weld joining hydro formed tubes in pillars and roof panels. The B-pillar uses Boron steel, the roof features industry’s first use of DP-780 super high-strength, dual-phase steel in the hydroformed roof front. High strength steel tubes run from the base of the A-pillar through the roof forming a roll cage.