Things cyclists should know … POV driver who's incapable of cycling

On the subject of replacing it ...
If Earthloop earned an unlimited amount of money, or we won the lottery, it would be done in a day, because I really hate the restricted visibility the comes from the tinted canopy. However, as we are not in a financial position to do so, we do have to make do with what we have. If we were in the financial position to purchase a vehicle from new, we wouldn't be in the position of having the tinted canopy windows either, but sadly, when one purchases a vehicle used, one has to make do with the legal, but not very intelligent choices of the ones wealthy enough to do so.

As has been said above, window tint is not part of the MOT so unless you have used a photometer under controlled circumstances and can prove that the window lets in at 70% of the light from the test source then no, your vehicle isn't road legal at all. Just saying.
Have you tried meths? If the tint is film you can dissolve it off. If its black glass then it'd be about £10 from the local glaziers to replace, hell, I could do it for that. Maybe stop buying Mr Earthloop beer and it'd be fixed ages ago.

For the record, I drive a box van with no rear view mirror. As has been stated above(and on the back of many many vans/trucks etc) 'Can't see mirrors? Can't see you'
If people choose to tailgate you til their out of your field of vision then it's their problem, the fact that you've chosen a vehicle with a restricted field of vision places the problem back in your court.
Also, I think it's fair to say that if someone sees a window on the back of a vehicle they will assume(mother of all cock-ups i know) that the driver can see through it, whereas they are more likely to modify their riding/driving/walking/segwaying around a vehicle with no rear window as they know full well the driver cannot see through steel.

I could go on but I'd be repeating what everyone else has said already.