I'm curious to see what the answers will be. In my opinion I think the Grand Marshal is the most forgettable. I always scroll past it like it's not there. When I do see it I always think it's a mod, but it's not! I never use it and it has a lack of configs.
the h-series used to be my favourite car actually, in the early stages of the game it was a blast to smash through the cargo box! but then the t-series came out and pretty much replaced it for me.
I don't know why... but while I find most old cars to be perfectly plausible, most modern vehicles in BeamNG leave me a bit cold... ETKs in particular kinda remind me the overstyled fantasy vehicles in the Saint's Row game series. So, my vote goes to the K-series.
Grand Marshal, bumpers get stuck on everything and it handles worse than a Moonhawk. I don't know of any reason to use it... if it had a race variant, it might be useful.
Actually grand marshal Isn't handling that bad If you drive it with steering wheel, It's kind off cool to drift an trash it My pick for most unused car would be a 200bx and all ETKs. 200bx- With it's tiny engine and lack of superchargers it's not pleasant to drive + it it terrible offroad (I prefer supercharger for gas engine because with turbos you get turbo lag which isn't a good thing when you're trying to drift) ETKs -I just don't like german cars for them being designed to be perfect so they don't have any character, Interior is boring the same as exterior and they're too predictable. (the same goes for SBR4) And my favorite cars are definitely moonhawk and barstow (both with stock suspension)
You should give it a try with the new update, collision problems have been drastically reduced . Ot, the Moonhawk, I don't like it's design too much and the Barstow is a similar car.