Probably the Haybale, it doesn't have the best acceleration or speed but it is very tough and practical, not to mention you get a lot of attention from the ladies just kidding, my fav is a custom offroad d-series with ext cab, pretty boring but gets the job done
In order for me. D series, Moonhawk, Boilide, Sunburst. The d series to me is the best exploring vehicle because of the off road modifications and personally the moonhawk is the Jack of all trades car because of its ride height. Bolide reminds me of classic 70-80 Eruo Super cars and the Sunburst for the same reasons as the moonhawk just faster.
Yeah the D-Series is the most practical for just about anything, and with the new transmission system it can do even more things like hauling camper trailers: Baja dirt bashing: And if you lock the rear diff, some epic powerslides: