I have some C-section that is 2300mm long and very heavy duty... I am thinking of using this as my draw bar??

I have decided on 8x5 and managed to get a very good deal on 40x40x2400 and 3mm thick at only $8 a length.. I bought 15 but I am going back for more as it is a bloody good price.. Matty is getting me to grab him 15 also.