This is set of three log trailers, which have larger space between forks, so you can load / unload them with front loader or big arm loaders. Autoload script was edited, so logs are now sorted to the piles.

v1.2
-added new 15m and 20m trailers
-added additional forks which can be folded / unfolded when you are loading short logs to 3 or 4 piles (15m and 20m trailers)
-added back attacher for trailer and trailerLow to all trailers
-fixed showing controls when attached to dolly
-Autoload script edited (logs are now sorted to the piles)
-you can change number of logs piles on your trailer from 1 to 4
-you can switch between piles manually
-you can show unload area to see where logs will be unloaded
-you can show load area to see current pile
-you can move, resize and rotate unload area
-improved stability of trailer
-all controls can be set in your Inputbindings
-you can enable / disable F1 help, will be saved as global in xml config file

12m trailer – 1 pile up to 12m, 2 piles up to 6m or 3 piles up to 4m
15m trailer – 1 pile up to 15m, 2 piles up to 7.5m or 3 piles up to 5m or 4 piles up to 3.5m
20m trailer – 1 pile up to 20m, 2 piles up to 10m, 3 piles up to 6.5m or 4 piles up to 5m

Controls:
KEY_X – fold / unfold additional forks (15m and 20m trailers)
KEY_B – start autoload
KEY_Y – start unload
KEY_O – change side (left / right)
KEY_KP_enter – change number of piles
KEY_KP_period – switch to next pile
KEY_KP_minus – shift unload position
KEY_KP_plus – resize unload position
KEY_KP_0 – rotate unload position
KEY_KP_multiply – show / hide load position (current pile)
KEY_KP_divide – show / hide unload position
KEY_lctrl KEY_t – show / hide F1 help controls (saved in xml config file)

If you find any errors or issues, let me know in comments or to kenny456@seznam.cz and i will fix it in next version.