Aldi delivery bays

109LWB:
I always wondered why they seem to be on a steep slope too… doesn’t that making getting cages on and off a nightmare?
I do taillift work with heavy items (200kg) and I always park as flat as I can so I’m not either Trying to stop something rolling out the back or pushing it up a slope.

So why not just the hight of trailer / unit to compensate