The transmission is fine. It's the same heavy duty version that is used on the 2500 series trucks that have a 6.0L in them. The temp increase is normal when pulling and it has it's own cooler.
I have not read or heard anything negative about the Borg-Warner transfer case.
An equalizer hitch is not necessary if you have the air suspension. They serve the same purpose. The weight distribution design will not be utilized (no weight on the bars) because the truck will keep the rear end level. Sway control, on the other hand would be great in helping reduce the effects of wind on the trailer. You can get a simple sway control setup without having to pay for the not needed equalizer setup.
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