I'm looking for a f-550 4x4 dump body. I found one that was MSRP 42000 + 10K for the 9ft dump and 4 door tool box. The 450 next to it was 40000 + 8K for the 9ft dump. First question is: What percentage should I expect to get off these with bargaining. I usually shoot for 10% and usually come close. Also this would be my first new dump purchase: should I look for a chassis, then find a dealer to put on a dump, or am I better just buying complete. I did find a few 2005 chassis's, but didn't get prices yet. All set and done I'm looking to get a 550 4x4 reg or crew cab, with 9+ft dump, and a plow, 4.88 gears, auto, and diesel. Looking to spend no more than 45 for all out the door. Thanks for any advice.