Chino & Kato thanks for your comments. With regard to Kato's comments on these pack howitzers, I would like to add that they can also be used as direct fire weapons. Therefore they are formidable not only for their mobility, they are also formidable in a prepared defence position. For more information beyond wiki see: http://www.forecastinternational.com/archive/or/vo0443.htmThe pack howitzers are far more mobile, in particular in the jungle. If necessary, you can even use transport animals to move these in disassembled form (Germany used to do that with the same OTO M56 until the mid-90s), or in theory move them on your soldiers' backs. You can't really do the same with a towed 155mm cannon, or a self-propelled unit.
I hope Kaybee who created a website on the Malaysian Army (see: http://kbmyaf.co.nr) and an expert on the MAF can let us know if the above list is correct.