I think Magikruiser would be more different to the top tier vehicles than dolphin dasher is so would therefore be better for a category. Also I see where you're coming from with not wanting to have too many specific vehicle categories. After Spear and Magikruiser there aren't really any vehicles that drive differently enough to need a specific category so I doubt that would happen

After Spear and Magikruiser I can't think of many vehicles that are different enough and fun enough to need categories so it's not as if we would end up with loads of them.

I think this would be good since, like the Spear only category, it involves using new strategies not seen when using top-tier vehicles, in this case different off road shortcuts not normally used, and I could see it being a lot of fun to speedrun. Thanks!