Timber Runner Wide With Autoload

This is set of three timber 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.
12m trailer - 1 pile up to 12m, 2 piles up to 6m
15m trailer - 1 piles up to 15m, 2 piles up to 7.5m or 3 piles up to 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

-added autoload script (thanks to Marhu)
-you can change number of logs piles on your trailer from 1 to 4
-you can show unload area to see where logs will be unloaded
-you can move, resize and rotate unload area
-tension belts
-added additional forks which can be folded / unfolded when you loading short logs to 3 or 4 piles (15m and 20m trailers)
-added back attacher for trailer and trailerLow to all trailers

Controls:
KEY_X - fold / unfold additional forks (15m and 20m trailers)
KEY_B - start autoload
KEY_Z / Y - start unload
KEY_O - change side (left / right)
KEY_KP_enter - change number of piles
KEY_KP_minus - shift unload position
KEY_KP_plus - resize unload position
KEY_KP_multiply - rotate unload position
KEY_KP_divide - show / hide unload position

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