Hey ado, welcome to Legions Overdrive! Generally when making a suggestion, it's important to flesh out your idea. What kind of vehicles were you thinking?
Generally, I don't think vehicles fit in Legions as much as they do in Tribes - the terrain doesn't really permit it (except maybe like...Blade Run). Maps like Frostbyte, Nivosus, or Moonshine are too small to permit actual vehicle usage.