Jockey Wheel on ALKO Chassis

I have been reading these papges for some time but only just joined. I have also posted the same query to the experts but feel the wider group will be benifical. any help please

I have a 2005 Fendt 540 on ALKO chassis, on the way to spain the nut securing the jockey wheel to the caravan chassis failed. i have only parked attached to the towing vehicle until now on site in spain and was able to revere tow caravan into pitch. In have removed the plastic covering plate but can see no way of removing the holding nut. I have looked through ALKO pages on web, but still can not see how to replace. I will need to use motor mover to get on drive at home but can not use without a jockey wheel. i have ten days left in spain before travelling home to the uk.