I've seen better for sale in Ak. for less.
I'd offer $1500.00 for it and forget it!
If he really wants to sell,he'll call you.
I say this because in my case,I look at what it will cost to get it into driving shape.
On this truck,It appears it ain't been used much,and needs some interior work.Maybe tires,exhaust,brakes,probably some wiring work.
You may have to spend up to a grand on it just make it dependable,so I'd knock off close to that much.
This is my opinion from looking at a picture and little info.
Mike.