RE: Re: Window shopping with Mom...
Depending on the XJ, there is often an extra wiring harness (and some relays) for the trailer towing package. Last time I checked the harness wasn´t real expensive at the dealer.
Transmission oil cooler is a must, believe many of the later models had the cooler even without the trailer package. Depending on which duty package was ordered.
Steering box cooler, is a nice but not necessary item.
If you have A/C most times you have the HD cooling package.