I can't remember what weight you are allowed to tow with the Disco but the handbook will have a section on this. In any case the Disco is well up to the job.
Make sure there is some nose weight on the trailer and above all take your time, take a bit longer and get there safely.
Jack up trailer one wheel at a time and spin the wheels to check for noisy bearings. So many people back boat trailers into water to unload and consequently submerge and contaminate the bearings with saltwater etc. If you hear any growling noises from the bearings, *don't* take it until they are fixed. Also check condition of coupling and tyres.
HTH Martin.