Thanks Allan. I've just bought an F6 and it has to work for its living! Last week I put 10 bags of cement in the back (250kg) and it seemed to be fine, but useful to know the official figure.
For any of you out there who are interested - I'm the mug who bought that red van (with daft chrome wheels) in the Highlands about a month ago, unseen on eBay. Well it goes fine - got me back to Hampshire with no problems - but whoever did the cheap respray wants shooting. I guess it will be more of a project than I planned so no doubt there will be a few more questions for you experts...
Shane