Ah, another reason to prefer duals over triples: higher tolls for that extra axle. Honestly I don't see the reason for a triple axle if the weight can be handled by two axles. You hardly see any heavy regular 5th wheels with triple axles anymore, most are two 8,000 lb. axles if they need the carrying capacity.
"Don't try and justify not doing it, extra axle helps in many ways." Please explain how an extra axle helps if two axles can carry the weight? I'm not referring to an over-40 foot trailer, just say, a 38 foot trailer.