I rung up about this a while ago, same answer.
My pickup weighs 1700kg, trailer ~5-600 (home made jobby) plus a toolbox and a couple of bulkier spares (put the rest in other cars for this reason) and the pug ~900
i put the lot (minus the toolbox and spares and with a full tank of gogo juice) on the weighbridge in work and it came in at 3.2 ton so i should be fine happy days