It's just a trial and error thing. Hook up. If your too nose high, lower it. If your low, raise it. Try to keep 6" of clearance between the 5th wheel cap and the bed rails once you get it level to avoid contact on uneven surfaces.
As to airbags, if your truck sags exsessivly once hooked up, they can level you back out. Many claim they add stability while towing as well.... especially on a 2500 series truck.
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