454

My ‘99 Suburban has 98k miles on it. Recent changes made: K&N Cold Air Intake Kit, Bosch Injectors, Custom Tuned ECM UltraPower GM / Workhorse 7.4L Vortec (454) Custom Tuning and a new radiator. Radiator needed replaced. Reason for the upgrades were to improve performance while towing my camper...

I recently bought the above with 122,000 miles to tow a 33 foot fifth wheel travel trailer. It does that job, but I feel it could do a better job. Anyone have any suggestions on what I could do to improve towing torque for a reasonable, under 1k, price. If this also helped mpg, that would be...