Thanks
That's a pretty sweet F800, man those things are huge. The biggest problem you'll have with the half-ton fenders is how wide the opening is, mine come within half an inch of touching and is something I will probably have to address after I get everything where I want it.
You're truck is pretty sweet as is, looks great with that wheel base, but I understand wanting to change things up on it. Good luck with the brakes, these older large trucks can suck to find parts, but I'm willing to bet something can be made to work on it easily enough.