As far as I believe you can only use SEP attachments (thats what Bunce said anyway)
I do find it hard work on wet heavy ground, Mine is peat based, did buy a plough attachment but the Plough would go in and then the wheels spin with no movement.
In lighter soils probably not a problem. The trailer is good, however it is not driven by the PTO for rear wheel drive, so up hill with any real weight can be a problem.