personally if i was you, i would look to find a two years old van which has suffered the "big hit" already,
put your 3k into it and use a personal loan/car loan from a bank for the rest, you then have the option to repay faster and save interest (make sure to check early settlement fees).
eg
2005 vauxhall vivaro £7000
Deposit £3000
Balance £4000
@
£4,000 15.9% 24m £193.72 £4,649.28
£4,000 15.9% 36m £138.43 £4,983.48
£4,000 15.9% 48m £111.08 £5,331.84
£4,000 15.9% 60m £94.91 £5,694.60 (lombard, 15%apr is normal on small loans)
I would probably choose 3 years at £138.43 to keep payments a bit lower but aim to overpay and settle within 2 years.
you could then do the same again if you wish in 3-4 years time. Otherwise you are funding a huge amount of depreciation buying or leasing new.
so 2 year old van @ £138 per month and it will be worth something when youve paid for it!
tempted you?
steve