If you're looking for manga similar to Linebarrels of Iron Specials, you might like these titles.
In the future, an organization called the GGP has taken control of the world. Rin Ogata was a promising up-and-coming ballet dancer, but suffered a serious injury while dancing and decided to quit. Years later in college, she comes across a club building and soon finds herself intrigued by a transforming motorcycle-like robotic vehicle called a "Rideback". She soon finds that her unique ballet skills with balance and finesse make her a born natural on a Rideback. However, those same skills also get her into serious trouble with the government.
Universal Century 0079 during the One Year War, where five young officers in the Zeon academy are involved in the war, experiencing the drama and pain of the first war in space.
Louis, a 14-year-old “mecha-geek” who specializes in computers and all manner of hardware, adventures around a post-apocalyptic wasteland in a Dreadnaught tank along with the android-girl Mamet and teenaged ladies Liza, Wooty, and Mill. Though the Great War happened more than three decades pasts, the remnants remain everywhere, and the threat lingers that those who escaped to Mars might return to Earth to remake the planet anew, regardless of whether or not the remaining inhabitants agree. One of the greatest current problems is the atmospheric conversion system Z.P.T., which has gone out of control, but while seeking a solution to that problem there are war robots to be fought, treasure to be hunted down, lost tech to be recovered, and a sexy operative of the Anti-Martian Earth Self Defense Force to be dealt with.
Alford Basiliskos, of the galactic Basiliskos Empire, has been sent by his father to conquer the earth with a giant robot. To his father's disappointment, Alford is more interested in passing his days eating doughnuts from the cute, kind Hoshigawa Yumi at her doughnut shop. Will Alford be able to find his motivation to conquer the earth? And will he ever find a way to get closer to Hoshigawa?
Energy crisis, scarcity of resources, etc. Leads to its only logical conclusion: war between east and west.