Your problem is that minivans and SUVs are not categorized as “cars,” so the car manufacturers can make far more of them without hurting their fleet average. If you want seating for six, Congress has inadverdantly motivated Detroit to want to sell you a much bigger (and ironically less fuel efficient) vehicle. I’m pretty sure that the 2013 Chevy Impala was the last six-seater car available in the US.
The Impala was a split bench, I was trying to figure how far back must one go to find a straight bench, the kind where one can get in the passenger door and easily slide to the driver,s side. You are right about the car vs. truck issue. I’d be okay with a STRAIGHT truck bench seat that could be retrofitted. Even the tricks have moved away from that.