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First off, take a look at the Trunker documentation in the downloads sections:
http://www.radioreference.com/modules.php?name=Downloads&d_op=getit&lid=19
It gives a general overivew of Trunker, which is about 90% the same as the LTrunk program.
Next up - have you modified your scanner with a discriminator tap?
You will need this in order to feed the datastream into the PC.
Look around the message boards and you'll see topics related to this.
I'm currently using a BC780XLT which allows a little easier access than a BC396T.
As for trunking without a computer - that would be sweet.
Maybe some type of small project box with a PIC controller and some small cabling.
Anyone up for the challenge???
I've used the LTRUNK program on Multi-Net Systems in Anderson, Indiana, and McLean County, Illinois with good results. It also does a very nice job on plain LTR and LTR Passport.