Different running lights, different mirrors, modified dash as mentioned, non fording kit, no horn button, something weird about the battery box, loose wiring under the dash, no mud flaps and what looks like a multi fuel fuel tank. Judging by the paint not applied under the dash, I would guess the owner figured $100 worth of fast sprayed paint would double the value of his truck.
With multifuels coming out of GL for less than $2000, I wouldn't go over that price if it runs and drives great. Especially when you figure in 5-6 mpg on store bought fuel with no other options.