Vanmaster Occasion \ Jeep G Cherokee
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When I first switch to a twin I found hte tyres had been over inflated and this had hte same effect, when i deflated to the correct setting it was ok.
Check the ATC light is green before you set off and again after a short distance and as zafiral says, feel the wheel hubs and see if htey are getting hot.
If you think there is an issue then speak to Al-ko, I had a problem with faulty wiring on the towbar and AL-ko were very good in sorting things out