Interesting comments, particularly, as I'm a registered Moving and Handling trainer.
My husband experimented and found the easiest and safest way to load / unload a machine was to make a plywood step, about 8 inches high.
The machine is simply tipped back, using safe and effortless leverage, the step is accessed, this is repeated to take the machine up to the next level and pushed forward.
The step is then placed in the van behind the Ninja to stop it rolling around.
My / our concern about ramps, is twofold.
The space required to use them
The danger of slipping
As mentioned above. It's all about leverage.
We have a little Suzuki, which, like Gary's Diahatsu, is brilliant for this work.
Angie