i live in south Louisiana near the Gulf. we have oilfield trucks down here but most are in Tx. i have pictures that friends have sent me that work in the oil patch in Canada. if you on facebook or have a email i can send you what i got..i do know that once the winch tower in in place another i beam sat on top of the maim truck frame then you have cross beams. part of the bed is wood up front, rear is flat . you can add a flip hid-a-way 5th wheel if you wish..let me know how i can send pictures then i can call you and enplane some of the pictures..going to work on the Mack i may not get back on here till tomorrow.