Thanks for your replies. Mersea took over Bramber & said their new trolleys would not fit my Bramber road trailer. I have now purchased a new combi from Hartley. I now have a new problem in that the winch won’t fit in the traditional place behind the ball hitch as the road trailer has the mast support tube welded onto the side! Hartleys have said that they sell a winch which fits inside the mast support tube. They say that the tube is strong enough to take the load. But I am reluctant to buy a new winch when I have a perfectly good one already and so am looking for an adapter to fit. No luck so far.