Obviously, because the JWs are anti-Trinity (and just about anti-ANYTHING Christian), all their material are against the Trinity. Because the Watchtower itself proves to be faulty in MANY ways, it's almost safe to assume that their views of the Trinity are flawed too.
(Although it's best to stick to Biblical evidence for the Trinity)
They try to disprove the Trinity by various methods:
1) They change their "bible" in key areas that prove the Deity of Jesus
2) They over-focus on the non-human part of Jesus, asking questions such as "If Jesus were God, did he pray to himself?" (understanding that Jesus was fully human too, refutes their reasoning)
3) They try to "prove" that the Holy Spirit is not a person, but contradict themselves in their own "bible" by calling the Holy Spirit both "it" and "he"
The list goes on...
In order to come to a better understanding of the Trinity, don't just read the material refuting it, read BOTH sides first.
http://www.carm.org has some great explanations on the Trinity and the Deity of Christ, as well as two audio files regarding the Trinity that you could listen to using Windows Media Player or even Winamp. ( http://www.carm.org/audio.htm)
http://www.christian-thinktank.com/trin01.html also has an extensive "Trinity" section.
But as libra_spirit said, we as finite beings will NEVER fully grasp the whole concept of an infinite God. We will be with Him for an eternity and ALWAYS see and experience new qualities and aspects of Him that we have not seen before.
Wanna know about the Trinity? Read the Bible, NOT the Watchtower!
Even by just reading their own, perverted 'bible' (without a guided tour from the Watchtower literature) one can reach the conclusion of a Trinity. (Strange how someone JUST reading the Bible alone will NEVER link the archangel Michael to Jesus... you need their over-complicated excuses with the scriptures to reach some form of understanding of their arguments)
"and NO ONE can say, "Jesus is Lord," except by the Holy Spirit" - 1 Corinthians 12:3 (Meditate on this scripture and its meaning)
So obviously one needs the Holy Spirit to acknowledge Jesus as God (and mean it!). Pray thus, that the Lord will send you the Holy Spirit (who testifies and glorifies Jesus) to teach you about the REAL Jesus from the Scriptures. Then READ the scriptures via the Holy Spirit, and you will notice the Trinity leaping at you from just about every passage.
No longer will Isaiah 42:8 and John 17:5, or Isaiah 43:11 and Acts 4:10-12 contradict each other, but become a harmony toward a better (if only slightly better) understanding of who God is and how limitless His love for you is...
Hope this helped, if only somewhat...
In Him,
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