Here's the sequence of pics
from an interesting day.
The new ramps are a perfect fit for my use although it is clear
that any normal car would squish them!
The whole evolution was a slow and careful affair, as I didn't
want to get the car stuck at any point.The first problem was that the exhaust can was very close (touching) the ramp at this point. The ramps have moulded ridges added for grip and it was only these 3mm high ridges that were causing the problem. In the end, I had to lift the car slightly to get it over the lumps.
And to prove this whole thing wasn't a Photoshop creation, here's the car back in the container all safe and sound. Given the lack of a reverse gear, gravity will assist in getting it out if the box next time!