Tanks for use in travel to the floor of bulky and heavy loads up to 48.000kg safely and economically, for example. boilers, reservoirs, heavy machinery, transformers, beams, structures, provisions, etc.. Tanks with a height of 145 mm with polyurethane rollers and ball bearings, front swivel for total control tanks, surface (support charging) slip, impact resistant, not damage the soil, flat weight distribution. Lightweight and compact for easy transport. The sets consist of: 1 swivel tank with rudder and 2 fixed tanks. Fixed tanks have through holes to allow alignment by a bar