Hi Belle I had Milenco leveler on my last van which was also a wheel lock. But unfortunely it only fitted upto includeing 14 inch wheels, and my new van has 15inch wheels.
It was a bit fiddly to fit but after doing it 2/3 times it became easier. as it had two different locks one eitherside of the wheel my insurance CO was best pleased as the locks could not be drilled out.
You were limited to the amount of lift If I remember it was about 6/8 inches but this is ample for most sites you could squeeze a bit more if you moved the lock nut to the under side of bracket so square on long bolt could virtully screwed right into the bracket.
They are not cheap but inall a good buy.
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I was on a site where a guy had been on teh pitch for almost 4 weeks with quite a few rainy days and it had sunk a bit and he had issues getting the leveller out.