Looks like a good setup you got there, tunes wise I think you should get the 87 tow and the 87 performance tunes. All you need to do to order the tunes on the php web site, they have a link there, and then explain to bill how you want your tunes to feel. the main question is which Edge do you have? if you have the CTS or CS then it will be simple to just upload the new tunes from fusion. If you have the regular old gryphon then you will need to send in the edge to get it converted to a gryphon. From what I am guessing, you have the regular old gryphon. this usually takes however long it takes to ship plus a few weeks. You will have to call PHP directly or wait for either Bill or Cody to respond to this thread to get a good estimate on time.
Another option that I just thought of, depending on how much your ATV and trailer weigh, you could get away with just a performance tune because they are rated to tow up to something like 2000 lbs. If they weigh close to that I would get the tow tune, but if the total weight of the trailer/ATV/cargo is less than that you should be ok, plus you can always switch over to the canned tow tune if you don't get a custom one yourself.
I hope this helped, and I am sure Jack or someone will chime in and explain some things better, but feel free to keep asking questions
