SBTT-4 has shown on snow passableness at a "Ratrack's" level. PEM-3 Equipped for realization of recultivation works has proved to be on a bog. At a clirence 800 mm it was not found places where this machine will get stuck. MT-04 has width of 1400 mm and is for today the easiest caterpillar floating machine adapted to year-round operation in conditions of Far North.