No, actually, the bumper really does have 800 pounds of lead plates in it. You can see them stacked inside the bumper.
I have posted a picture of the bumper warning here:
http://www.irv2.com/forums/f87/800-pound-bumper-234160.html
The hitch is rated at 5000 pounds towing and 500 pounds tongue weight, as verified by the information sticker inside the wardrobe.
I'm not entirely sure why Fleetwood would add ballast like this except to unload some weight off the front wheels, which is rarely a problem in a class C.
Anyway, as I had originally asked I was wondering if anyone had removed some of that ballast partly or wholly. I've sent five emails to Fleetwood regarding this but they have not replied.