If you simply want to light your trailer, the Side Trailer Lapms MOD will give you plenty of light.

If you're asking how to create the brightness of metallic skin, create two files, one with a plain white file and the other with a plain black alpha channel, in software such as Adobe Photoshop, load a semi-transparent image (such as a cloud like this skin) into the first file, select that layer, output to the alpha channel with "Duplicate Layer", and make it black and white. Then save both and make them DDS(Be sure to save it in DXT5 format. It will take some time, but I think it would be easier to load the two files in "DXTBmp" and save them, then output them again as DXT5 DDS in "GIMP").

how do you make the trailer skin to be light in the dark?

Corrected to "Hoshimati" which is the official name.

Is her name spelled wrong..?

Do you mean the third photo? This was shot in a port in Iceland with ProMods.

The last photo is FH2012.

how to make the trailer look like the the last photo at night ? please