I've built 3 5er friendly beds for my own trucks. I like doing my own so I can cut off the excess useless frame rails at the back end of the truck and build a bed that's shorter behind the axle for more front storage door access on the 5ers. On the last one I used 11 ga rectangular pipe (various sizes, bigger for the deck and smaller for the sides and headache rack) and it's 3" above the truck frame + 1/8" treadplate. The sides taper down towards the back end for plenty of clearance for the 5er and I welded in members for the 5er hitch mounting and g-neck ball and built an integral bumper. The deck plate is 1/8" 6061 t6 and the sides, front and rear are 1/8" polished aluminum. Even with all that aluminum that sucker still weighs 850! $2000 in material including the lights and 3 months of work - nights and weekends. $8000 installed for the CM w/hitch sounds very reasonable! Craig