GEN7 HAS ARRIVED
The Gen 7 has a specially designed bearing assembly or endcap which is mass swagged onto the end of the tube under about 35 tonnes. The advantage is that it eliminates the need to weld the ends of the roller.  The bearings can be either double angle contact bearings or double roller tapered bearings.
 A safety bar can be inserted (like a mini axle) between both endcaps, however there has not been any calling for it since the Gen 7 went into production.