Many thanks to all for some excellent ideas! Bags of peat I would never had thought of. Clearly I shall need to recruit a team which sounds like I may need appropriate incentivisation/fuel (Grolsch). Having read the advice I will await the winter overhaul so I only do this once. In the interim I will venture forth with that stalwart of the sailors toolbox – duck tape – to effect emergency temporary repairs to said trailer. Another victory for empowerment through shared knowledge. Thanks.