mraps are categorized as category 1 or category 2, depending on usage and passenger compartment space, and navistar produces the maxxpro in both sizes, although the vast majority of those sold have been category 1 mraps. the maxxpro plus model comes with dual rear wheels for increased load carrying capacity, such as an ambulance or efp protected variant. the latest model produced is the maxxpro dash, which is a smaller and lighter category 1 model. both the plus and dash models use the maxxforce 10 engine with 375 hp, in place of the dt 530 with 330 hp, used in the original base model produced.