Thanks mate. I think you've nicely encapsulated all of the issues/thinking I've been going through.That will be slightly tricky as there wont be many installers out there who would know the mini well to perform this. Best to call a few companies, talk to them and see if they are hesitant to do the job or are not sure where the mount ponts are. Going to a mini dealership might not be ideal either.
Good luck.
Aye. For the number of times I'll use it, I think I'll just grab a GoGet if I need to carry anything big around or do an Ikea pickupSounds like it falls into the too hard basket.
Probably your next best bet if you want to go down is to get an engineer to design one for the mini f56 but that will cost.