-with SB02 wheeled steel base, high loading capacity, adjustable feet make it suit bad ground conditions. it can works with both SP series and BN series. -HS01 top section, it can works with both manual hoist and electric hoist system -TRS01, tower erectinig asistant system brings you much more convenience in setting up the tower, saves a lot of heavy labor work in erecting heavy labour job. -Every tower with four outrigger, reinforce the stablity of your tower.