I'm planning to put together a 7.62x39 AR for a "truck gun". Its intended use would be mostly general vehicle born defense and perhaps some consideration for home defense (tho I have a regular carbine for that). The pistol would be a 10.5" with Thordson cheek rest. The carbine would be a 16" with Deadfoot Arms folding stock which allows firing in the folded position. The pistol and the carbine with stock folded would both be around 27"-28". The pistol would allow a good cheek weld at that length. The carbine would not. But the carbine would allow for greater accuracy and more rapid follow up shots with the stock deployed. Either one would have a Vortex Spitfire AR 1x for its optic.
The Deadfoot Arms folding stock kit is expensive but I already have a 7.62x39 carbine to base that build on. I don't currently own an AR pistol, so I would need everything. So the cost is probably a toss up.
What is the general consensus on which of these would make the best "truck gun"?