Between the F350/F450/F550, looking for differences in the suspension systems for these models and other various parts. I know the F350 can be lowered but the same parts can't really apply to a F450/F550 or so I have heard. Just looking for a comparsion. I'll probably still just get an F350 for various reasons including cheap insurance but would like to know more about everything. Anyone know of a site that would talk about the differences?