Since there are no sensors on the tilt head, the Gen-3 assumes the attachment is horizontal. If the attachment is tilted, the load reading will become more inaccurate (as the attachment is tilted towards vertical). Make sure to always lift the load from the ground by raising the boom rather than tilting the attachment head. 

Tilting the attachment head can cause pressure spikes in the hydraulic system, affecting the pressure sensors (which the Gen-3 uses to measure the load), resulting in an inaccurate load reading while the head is being tilted. The load rating on most long reach attachments is far less than the capacity of the machine, which means that if a load is lifted which exceeds the load rating, the attachment will likely break or be damaged before the rear wheels lift off the ground.