Kei a mātau ngā pūtē wai pōkere e whakamana ana i te mana tahuri mō ngā whakamahi motokā, pumau, me ngā mahi hanga. Ki ngā kapasitī e āhei nei i te 2 ki ngā 20 tona, he hohipera hoki te rautaki e tae ana ki raro i ngā motokā iti-āhua. Ko te hanga toko i te kōwhai ka whakamana i ngā tahuhu nui, ā, ko te waehu haumaru whakauru hei whakahē i te whakamutu i te kuhu. He pai rawa te mahi pūnaha me te whakawhiti pai ki mua hei tiaki i te kaiwhakahaere, ā, ka noho whakapono mā te whakarerekē i ngā pūrangi tāreka, i te whakatika i ngā huanga, me te tahuri i ngā pūnaha nui.