ive watched mammoths run, and they break easily..even with highly expensive-and-why-the-frick-would-you-spend-that-much-money-on-upgrades, and they still break easily. personally, i would go with the mgt, since its been proven to be a good truck. Before you could get a mammoth working, you need to buy $120 chassis braces and $70 hinge pin retainers. NOT WORTH IT!!!!