SLF here. Love the term and would like to echo Robin Pilot's rant:
For god sake. Can no one take a joke anymore? Why are there so many idiots in the world looking for offence in every damn thing?
Why does the world have to stop coming up with funny sayings or names because some idiots are born without a sense of humour?
Are you really that high up on your horse that you can't fathom the need for humour to brighten up and colour our lives a little? Yes there's a butt of the joke in this instance - as there is with every joke. We're humans, we take the p!$$ out of each other. It's not done with malice, it's actually done to cheer each other up. Get on with it.
So to anyone who is GENUINLY offended by the innocuous, silly and cheeky term "Self Loading Freight" then I say GROW UP, for god's sake.
I have grave concerns about where this world is heading on the humour front.