I doubt this will happen: The base model has six spots: two in the front cabin, two at the rear hatch - and two in the middle. With the original Offroader the middle spots can be used to fire forward while the rear two spots are designed to fire backwards. The new RF variants have just replaced the middle two spots from exterior with interior - likely without touching the two rear spots at all.
If at all a classic leaning out the window would be the way to go. Also: There has to be some balancing: Allowing the RF variant a full 360 from the rear positions would raise the question: What's the point of it then? Just carry two more infantry bt they can't shoot? If you want that extra firepower use a standard Offroad then. It's a balancing tradeof.

In T180386#2591358, cryptearth wrote:

... The base model has six spots ...
... the original Offroader ...
... The new RF variants have just replaced the middle two spots from exterior with interior - likely without touching the two rear spots at all. ...
... the RF variant ...

The RF Pickup is not a variant of the vanilla Offroad. It's a completely new vehicle. It doesn't inherit anything from the vanilla Offroad and its model is entirely unique. The vanilla Offroad is not the base model of the Moose.

Some poeple tho ...
Anyway - what OP is askin for already works:

Agree. Looks like I confused general pickup with covered one with full frame.

So - you do ask for leaning out the window and for a 360? I guess THAT won't happen cause the engine isn't able to handle that - at least for now.
Yes, A3 makes use of skeleton based animations - so same as with "fanc dance moves" it sure possible to "bend" a units body in such a way it would look like someone hanging out the window of a car - but for that first the Offroader would require lower-able windows (otherwise it would break the immersion with no windows at all or leaning "thru" a closed window) which require modification of both the base Offroad as well as the new RF pickup and likely many other vehicles.
One also could argue: What about the non-covered infantry transports like the HEMTT Transport? Why are only the rear facing two spots able to shoot and not all the others?
Same as with my "expansion of the cargo/vehicle loading system" it's quite a lot to ask for - but on the other hand: This game already had 10 years and a lot of mods brought us such stuff (looking at ACE) which the base game just lacks. Why weren't such features implemented? Or will they in A4?
Looking at DayZ: It has base building and all that AltisLife RPG stuff built in - so it shouldn't be hard to port that over to A3 (as, as far as I know, DayZ still uses the RV engine but only the graphics part of the Enfusion).
In the end - we SHOULD expect a combination of A3, ACE and DayZ for A4 - I guess it boils down to: What can we ask from the base game and what will kept as mods?
I would love to use RF the same way as the additional assets from Laws of War - but either I don't or I have to rely on people use the Launcher to connect to my server - and when you start with that you can throw ACE and TFAR into the mix.
I hope all that mod stuff gets sorted out in A4 so they can be loaded at run time instead of having to relaunch the game for every server and rely on the launcher.

So - you do ask for leaning out the window and for a 360?

No, I would like what I wrote about.
At this moment only in unarmed pickup you can stand up and shoot forward, and I would like the same for armed pickup and covered pickup with replaced cover by full frame. AFAIK, this can be easily done by updating configs.

One also could argue: What about the non-covered infantry transports like the HEMTT Transport? Why are only the rear facing two spots able to shoot and not all the others?

Well you can create a feature request. :)

a lot of mods brought us such stuff (looking at ACE) which the base game just lacks.
I would love to use RF the same way as the additional assets from Laws of War - but either I don't or I have to rely on people use the Launcher to connect to my server - and when you start with that you can throw ACE and TFAR into the mix.

The problem with DLCs and mods is that players who want to play on a server that requires them have to download and enable them. Unfortunately, even after 10 years, a lot of players don't check what DLCs and mods servers are using and don't understand why they can't join (let's be honest, almost no one uses the Launcher to search and join servers); a lot of players don't know/want to download and enable DLCs and mods. Moreover, I know players who still don't have official DLCs such as Apex or Contact.
CDLCs have another problem: a lot of players think that they have to buy them if they want to play on servers that use their assets. They still after years since introducing CDLC program unaware about compatibility data, which is free.
So, the more things are part of the base game, the better for players.