If you are talking about the resin top model of trak..the roof line is above that of the drivers cab...then the answer is yes..it is possible to remove it..however it was not designed to be removable in the same way as the hardtop of the Sportrak to be replaced with a softop.
The 4trak resin top is composed of a multitude of parts (side panels, roof panel, back panel, inside trim panels etc).
If you wanted to remove it permanently to convert your vehicle to a 'pickup'..I could see the point..otherwise forget it m8..it would take a couple of hours to get it off and the same to put the damn thing back on again..as I say its not designed to be easily removable.