Power level HELP needed

Can anyone help me out and power level my commando, siren or gunzerker to level 72 i am looking to get the achievements for these characters and the story but want to do it as quick as possible I have some lvl 72 items I am willing to trade and also have some lower lvl gear as well the items I am willing to trade are

Lvl 72 Practical Buitcher
Lvl 61 Expandifide Sawbar
Lvl 72 Sledge’s Shotgun
Lvl 71 Royal Deliverance
Lvl 50 Hard Unkempt Harold

My GT is Tukka dekka bus, any help is much appreciated. I am online now and will be for a while