Have you bought it yet? the Excalibur fits easily(alloy wheels) and it's insurance approved,don't think the Nemesis is.
Have a look on Utube,the videos cover them both,
it just fits my coachman but you have to have the special wheel nut in the right place because the bar that goes through the wheel hits the brake drum, motor mover etc...
the brake drum seems quite a large diameter compared to the radius length of the wheel lock.
------------- First van bailey ranger 550/6
Now the proud owner of a coachman amara
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.