Is the logo on your trailer paint or plastic,
If paint, you will have to flat the paintwork down to remove edges and get a uniform surface, and then get a tin of Barcote aerosol from either car spares shop or automotive paint supplies and spray over the area that you have rubbed down. You can the paint over the logo / sign without the old paint "reacting".
If plastic letters are used, use a hair dryer and warm up the logo or signwriting , peel them off and wipe over with petrol on a rag and this will take off the adhesive.
Paul Reynolds, May 2008