I’m not much of a modded myself and coild only imagine this to be difficult to do.
But would be very helpful.
A permanent rear view mirror at the bottom of the screen. Even a toggle switch in the options.
Placing a camera on the back of the rocket car and possibly fish bowl the left and right edges just a bit.
I could see something low and flat being much longer than it is tall.
Maybe Psyonix would do it.