Thats the towing pin doggydog. NLG pin is right up in the wheel well, needs a special extention tool to install it.
Now that I think about it, I have had the gear pins installed once for loading. Was a heavy 40ft container through the nose. My main concern was possible cresting when the oleo sinks under the weight. There's not much room to play with. Installing the pins kept the aircraft stable. Very much a one-off situation though, and definately not required for normal ops.
rgds