Ah, I hadn't quite caught those dimensions. Looking at the images, I guessed it would fit, but it sounds like it's very slightly too large width-wise (65cm across, vs Max Load Area of 64cm).
If it can be compressed slightly in that direction it would fit, but it depends how easy it is to do that.
Unfortunately there's no easy way to widen the space between the wheels. Sawing the metalwork in half would work, but I suspect you'd rather not do that immediately after buying a trailer!