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Just some info to let people know that I have got unitrunker working with a single RTL3832U dongle and linking it to unitrunker the only problem is that you have to keep unchecking the tune to control channel button in order to follow the conversations. I will go in to a little more detail after you have your sdr and unitrunker properly set up to track using 2 dongles. This has to be the trunking version of sdr tune it to the control channel freq and set your filter bandwidth to 7000 and your skip 12.5. Okay here is the important part in the trunking window make sure you have your control freq the same as the one in SDR entered where it says tune to control channel and check the box. After this start SDR and unitrunker and make sure they are linking up. If they are then you are on the right track this is the annoying part while sdr is running uncheck the box that says tune to control channel it should still stay on the control channel. When SDR tunes to the channel and you will now here the entire conversation soon as they are done talking you have to manually check the button that reads tune to control channel every time but hey it works for now. Hey maybe in the future they will incorporate this in to the latest version of sdr so it will check it self after the conversation is over. Oh i forgot a important part you have to create two virtual cables and set unitrunker to listen to number 2 and make line 1 your default communication device. hope this helps someone out.
here is a link for setting up sdr http://public-xrp.s3.amazonaws.com/docs/sdrsharptrunk.htm