I built one using very heavy castors and steel box sections. Can be moved using pinch bars to adjust castors and then it pushes very easily. Depends how far yours has to move.
Hi DownWest,I also built one using the rear axle from a Renault Master and the front steerable axle from a LDV truck. Bit joining was two RSJs with the keel between. Boat 27ft and 4.5 ton. Used in fresh water so not so worried about bearings. Bits came to about €600.
Hi DownWest,
Would you please provide some pictures of your DIY trailer?