Billy v

Hi all Can anyone tell me what my van is worth as I am wanting to insure it. We just purchased it (second hand) and insurance companies, being what they are, require us to decide the market value. This is proving hard to find. We know what we paid for it, but market value is a different story. It is a 2002 Cross Country full van, not a pop top. It is17.6" long comes with annex. But nothing fancy things like air con.... A queen bed and a kitchen. Anybody got their view on how much market value would be??? Thanks Billy V.