I just had an idea: why not create a kind of citroën 2cv with a very soft suspension and maybe create a new brand in the game like ETK, Gavril but for citroën or another French brand.
1970s Burnside exists in RoR, also, there was no reason for Burnside to go defunct until late 1980s since American auto industry was in full prime these times.
Who cares about corporate dealings? The Altima would be another compact/midsize mediocremobile, this time 2-door. And we have a ton representants of this class in the game, from 60s Japanese (Miramar) to 10s Japanese (Sunburst). We should try smaller or bigger mediocremobiles.
How many Nissan-based cars are there? 1 The 200BX was the only Nissan-based vehicle, and it was more of an sports car instead of being an mid-size.
There's not a whole lot of midsize vehicles anyways, so even if it's similar to the other midsize cars, there's an big void there it could fill partially.
Hirochi's line-up has an void, on the equal level of Bruckell, since you did name it as an Hirochi if it was an BeamNG version of it. An Ibishu would be too obvious, almost as big (vehicle amount perspective) as Garvil.
Basing a car suggestion on its brand, rather than its relative qualities in the game, is rather pointless.
I think there is a Brazilian vehicle released (of course it is not made in Brazil, but it is present in a big number there), the Fait One (Fiat Uno).