hmm...after further investigation, I have found that the Active Drive II automatically gets you the 3.517 gear ratio, so maybe that's why they didn't include it in the prep group. I ran a quick locate on 4 overlands, all V6 4x4 models: AD-I without prep, AD-I with prep, AD-II without prep, and AD-II with prep. the two AD-I cars had the 3.251 ratio (the standard V6 gear ratio) and the two AD-II had the 3.571. the package had no impact on gear ratios. my guess? Since the overland was originally available in ONLY the AD-II and the AD-I model wasn't available until recently, they have not included the upgraded gearing in the package because it was once standard equipment on the overland. AD-I overlands are getting the short end of the stick by not offering the added gearing in that package, and I am cautious that they can even tow the 4,500 pounds that they claim.
UPDATE: CONFIRMED! the AD-I Cherokee CANNOT tow the 4,500 lb limit that Jeep's website claims, and I have also confirmed my reasoning above. I took the same 4 vin numbers on the cars I found above and ran what is called an OwnerSupport+ on them which gives a list of equipment, capacities, and abilities, and the ONLY car on the list that came back with a 4,500 lb towing capacity was the AD-II with the prep group. ALL others said 2,000. so it appears that the gearing IS important, and upgraded gearing is ONLY available on the Overland if you get AD-II.
my personal recommendation is to get the AD-II anyway. I didn't want it to start, but the one I wound up getting was the only one in 200 miles that had the equipment on it I wanted, so I sprung for it, and man am I glad I did. I've used 4LOW a ton of times: when beaching, when pulling stumps out of my backyard, when curb hopping at football games to get out of the parking lot, etc. and I've used my trailer hitch a ton more than I ever thought I would. plus, the additional ground clearance was nice, even though I increased it with the lift. my advice is to get the AD-II with the prep group if you're factory ordering. you can't go wrong to be prepared for all situations.
2015 Latitude V6 AD-II
Mods: List was getting too long for my sig, check out my garage
for a full list of mods
Waiting for install: MFC switch plate w/OTRATTW custom switches
Official test car for the SmartStopStart module program