Truck bed extender for variety of makes of vehicles

A truck bed extender which is universally mountable to a plurality of original equipment latching pins and latches for different configured or brand vehicles. Each sidewall is connectable to original equipment tailgate latches on a truck bed body. The mounting interface allows connection for a number of heights relative to truck bed for those original equipment pins. Adjustable simulated mounting pins along lower margins of each sidewall of the bed extender allow for compensation for different placement of original equipment latches on the folded down tailgate. One example is sliders that allow such adjustability. Optionally, stability members of plural configurations are automatically positioned in the gap between tailgate and truck bed body to cooperate with different existing structures on the tailgate of different vehicles to add further stability to the bed extender.