Funky.
The cab extension looks a lot like this one...see the small side window?
BTW, this pic was on eGouge a few years ago, that's all I know.
The side trim looks like that vinyl stick-on crap from J.C.Whitney.
*EDIT* Ok, now I'm noticing more similarities between these two...
The red one is; obviously a Uni, has the 3-bolt front bumper ('64 & earlier style) &
twin I-beam fender badge.
The blue one is; obviously a Uni, has leaf springs on the front end ('64 & earlier style) &
twin I-beam style fender badge.

The blue one seems to have a '65 Chebby (upside down style) front bumper, but that could have been slapped on by anyone. I wonder what the grille looks like?
They both seem to have about the same size rear fenders.
Maybe they are production trucks from another country?

My "Slickitis" affliction began here...
66 F100 CC/
65 F100 CC/
66 F250 CC
If it starts to rain, they'll tax the splash.
If you want to fish, they'll tax the bass.
If you plant a yard, they'll tax the grass.
If you don't play nice, they'll fine your *$#!