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Electric brakes and air bags or heavy duty rear springs. A radiator proffessional flush. If it has not passed its towing capacity then it should handle it well.
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Rear springs will only need to be upgraded if there's significant load on them. If the trailer weighs 1.5T with a ball weight of only 100kg, and there's no significant weight in the rear of the tow vehicle then the rear springs aren't suffering.
If you've got a 2T trailer with 250kg ball weight and 500kg in the back of the tow vehicle then you'll need new rear springs - I wouldn't rely on Polyairs.
Keep an eye on Gross Combined Mass - it can be less than the sum of Gross Vehicle Mass and max trailer weight. But I don't think you'd come close with your 80 Series.
Once trailer mass passes some point (2T?) you're also required to have a break-away braking system.