Vehicles/Pods that do not effect mouse aiming?

I don’t know whether or not I’m looking for a tool. I don’t know if there’s a Wiremod way of doing this. I don’t know if there’s a downloadable thing everybody knows about which I can’t seem to find using any combination of search terms relevant to what I’m looking for.

I do however know something like this used to exist back in the mystical times of GMod 9.0c. I’ve a memory of being in a barrel entity of some sort which maneuvered my being around but did not effect my camera view direction when it was rotated.

In an ideal world I’d like a regular Airboat seat pod which when it moves in the world, does not move my camera with it.

I’ve extensively searched Steam Workshop and Googled every relevant search term I could think of. Could anybody point me in the right direction to creating or finding such a thing?