It was not fictional; but a proposed prototype vehicle. It was not bought at the time.
The roof did not support the gun at all. It was on a turret supported by internal supports.
It was known as the RED-T Prototype.
https://www.hmmwvinscale.com/hmmwvredt.htm
Trisaw
22
I sit corrected…thanks, Gino! 
It’s a poor man’s Typhoon 4x4!
@DennisatAutoloader
Countered with the Cockerill CPWS GEN 2! 
Cockerill CPWK GEN 2
Still findable on Evilbay from time to time.
As for fun- yup they sure are!
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Thanks, I really need to keep my eyes open for one.
I have an idea to build one OOB and another a basis for something from the Red Dwarf universe.
