It's worth whatever someone is willing to pay for it mate. I would imagine a tidy long wheelbase ute would be worth slightly more than the equivalent SWB version due to the fact that they are newer and, atleast in Australia, rarer. Your choice of wheels will make it more saleable too. Some of the LWB versions have factory a/c too which would make it even more valuable.

The best way to find out is to have it valued by a professional. You can generally organise this through an insurance company.
Regards Matty