Whatever you want it to be. Depends how you load the van, more weight at the back the nose is lighter and vise versa.
It is more about what nose weight your car will allow!
Cheers
Richard
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Legally in the UK, noseweight should be at an absolute minimum of 4% of the vans MTPLM and recommended to be between 5-7%. Your Lunar has (I believe) an MTPLM of 950kgs, so approx noseweight will be 65kgs. Assuming though that this post is a follow on from your other query, I understand your cars towbar has a limit of only 50kgs, so you've got to achieve approx 5% of the vans MTPLM to keep within your car limit.
This should be do'able for the 2 berth, but I'd not be keen on trying it and shifting too much stuff rearwards can result in instability. It's too tempting to stick larger/heavier items towards the back, but you need to aim for keeping the heavier item slightly rearward of the axle and avoid too much weight in the front, otherwise you'll risk a 'see-saw' scenario.
This will need careful packing IMHO.