I have a Navara and it's great for a back up vehicle and it's also the vehicle the wife uses daily.
That said, using it daily for WFP would be a bit of a pain. Too many reasons not to in my opinion. Main reasons though, access (rear only, unless no hard top then security is the issue), storage, height of tailgate, mpg (28 at best).
Security is also a consideration. Whilst having our hardtop fit a guy called for a price on a side window as someone had smashed his. It came in at £800! The full top's aren't much more. Not hard to get into the back for a determined thief so you'd have to be emptying poles / tools every night and what about when working out of sight of vehicle.
If you can I'd go for a van, double side doors, external access ports.
For the price of that pick up you could buy a van already fully fit out.