[guruerror]

I've been reading a bit about these and the first thing that pops out at me as a 'problem' is the air filter that mounts on the unit.

Unless your truck's going to be a pavement pounder I don't think it's wise to have any kind of air intake that close to the ground. You get in some deep water or do some splashy-splashy and you're screwed...and not the good kinda screwed.