The Severn School Sailing Team is selling its 2016 set of custom Rapide 420 trollies (https://www.rapidetrailers.com/ ). Rapide makes great trolley.trailers for one design dinghies, based in the UK. These are over $600 new, before shipping from UK.. 7-8K replacement cost.
These are rail supported, galvanized steel trollies that are used for high-end dinghies like the 470, 505, 49er, etc. If you boats live on dollies, it is so much better to be supported by the rails. These trollies are as solid structurally as the day they were built. We have 12 of them.
They do need some work:
Many of the articulating rail support bars are bent, and in one case I believe one is missing. The trollies will come with 19 (of a needed 24) wheels and tires, with 2-3 damaged wheels and tires. Some of the padding could use refreshing.