Ahh yes thought so. Well firstly I'd say the ad s full of BS really so I kinda have idea about the owner. I think that there is a good chance that if they came on here there'd be some fairly major arguments! His views about manual over auto for example would cause a punch up. So don't be fooled by stuff that he states as being absolute. General condition of the vehicle does give a good measure of how well it's been looked after but again don't be fooled by stuff that doesn't matter. It may well have had new air fresheners every 6 months and the tyres filled with mountain air but that's all just flummery. He says it's unique, well all 80 are. I two unique ones myself. Ask him what makes it unique and when he says it's the snow edition, let him know that you do know what that is. Clearly then you will be MORE than an expert. Ask him what MPG difference he has seen between 2x4 and 4x4. Has he corrected the castor after the suspension lift?
On balance if it's nice and black underneath due to it being an import, with the fridge and the roof tent it's probably worth the money. It saves a lot of work, trust me. But is it a must buy? No, I'd say not. If it drives well and looks generally good and you like it, then I'd say you will be fine. But what you are really buying is the extras. The truck is worth what? £4k maybe then tyres, suspension, tent, fridge would take you to maybe £9k. But they're just bolt on bits. So don't let him kid you it's worth £30k. It's not. What he doesn't really show is what he's done in side in terms of any kit like inverters and such. Extra power points, storage etc.
Best of luck.