Dave,
My brother and I bought a 3023 this past April. He and I have a Cherokees, although I now use the wife's Liberty for towing. We got our WDH from the stealership. I would not get a round tube hitch. A number of folks have had issues of them winding up like a torsion bar spring. They also rely completely on the welds to keep from rotating, where the conventional square tube hitch has the additional reinforcement of the shape of the mount. Our bars are 800 lb, and they seem to be adequate.
For mirrors, I picked up a set of CIPA universal mirrors, and they work quite well. One thing if you get them: you have to fold, maybe 1/4 inch or less, the strap going to the top of the mirror. If you do this, it's quiet and peaceful at speed. Otherwise, it sounds like a giant mosquito outside your door. We found this out by accident when one mirror was noisy and the other wasn't, and I found the twist in the strap.
I have a Prodigy, and I love it. It is mounted to the right of the steering column on the lower dash in my Cherokee. Perfect position for emergency use, and out of the way otherwise.
I took mine in to a shop to have the wiring done. If you can find a factory wiring harness in a wrecking yard, that's the way to go, it just plugs right in. I wasn't able to find one, so the shop put in all of the required connections. Luckily, the Cherokees are wired for a brake controller already, regardless of whether they had a factory tow package or not. Look under your dash for a blue wire labeled "electric brake" with no connector on it.
I haven't upgraded anything on my Cherokee. It has a manual transmission, so auxiliary coolers aren't an issue. I don't believe you would need an additional engine oil cooler. The automatics have a 3.55 final drive already, so that should be fine. The manuals came with a 3.07, which is a little tall for towing. The only thing that was required was to change the rear end oil out for synthetic. We used Royal Purple, and it already has the limited slip modifier in it. As long as your Cherokee has A/C, I believe you have all of the fan upgrades, so you should be fine. Enjoy your trip.
Dave
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