anguswilly
+1y
I too have thought about it.
Easiest way would be to cut the frame behind the cab off a longbox single cab and then weld it to your frame, this would need to be done using approved frame repair techniques. Once you do that, you'll need to extend the driveshaft and things like wiring, fuel and brake lines and exhaust.
I am sure someone has done it before, just can't find any right now.