Hi Gixxerkid3,
Been there, done that. Get 12" longer safety cables rather than extending your existing ones. You won't regret it. But read through all of my reply before ordering them.
We first towed a small car that did not require a riser. When we switched to our Jeep Liberty, a tall riser was needed to make it work right and of coarse longer safety cables were needed. I also highly recommend buying two Quiet Hitch thingies (or equivalent) to eliminate "cumulative play" introduced with the riser. There are a few designs available. I recall another design that came out after buying our Quiet Hitch brand that was interesting. If buying replacements, I might consider that one. There are a few different available sizes so be mindful that you need the 2" size.
Our first trip we towed without the riser. This was a VERY BAD idea. Don't be tempted to tow this way because of having shorter safety cables. The "bucking" was very irritating.
Having the riser is a good idea in another way. It moved our Liberty farther from our PC, increasing the gap between the two vehicles when in a sharp turn. Once setup, I strongly advise to tow into a parking lot, and do a very sharp turn (a donut) while having a spotter. You want to make sure the side-tip-end of your Wrangler bumper will NOT contact your Phoenix bumper. It gets uncomfortably close with our Liberty with riser alone, but they do NOT touch so I am okay. But I wonder about the Wrangler. If the two bumpers make contact, you will have to add an extender and another Quiet Hitch. Of coarse, then your safety cables need to be even longer.
You don't want to increase the distance between vehicles any more than necessary because there is a drawback to the extra distance. When making sharp turns, our Liberty initially turns in the opposite direction of our PC, then has to quickly turn in the proper direction to follow. The extra distance makes this phenomena worse which is very hard on the inside of our Liberty's front tires. It's so bad that I actually have two set of tires for our Liberty. One set is for towing, the other set I put on when we are back home. The wear also makes a terrible road noise that drives my wife Irene crazy. We tolerate it on trips, but she doesn't want that when back home. Needless to say, every 3 to 4 years, our "home tires" are repurposed as "trip tires" as the old "trip tires" are cycled out of service prematurely.
Everything has it's trade-offs.
