Unless the rear tyres are really low profile ?? 45 series is fine ..18's I assume are lower A.R ??
Just keep tyre pressure a little higher and as said balance weight in van.. It will be at least 2 axles .. Yep trans cooler is a must .. If tow bar was fitted by dealer chances are it will have cooler fitted.. A lower final drive helps, even smaller dia wheels just for towing?? Will achieve the same result...XR's usually have lower final drive ratio...
If car is in top nick, well maintained ?? It will be fine...
Firmer springs and shocks are not way expensive either..
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