You have to use stock lifters,there are no others avalible.
Im pretty sure you dont have MDS,so make sure you get the right ones when ordering.
LT headers are worth the money,so is a ported throttlebody.85MM s good.
A electric fan worked great on my 2003 2500 Hemi regular cab.
I towed excessive weight like yourself.
Its hard to find LT for a 2500 hemi.
I had custom LT made for my 2003 from KOOKs but sold the motor.
Im pretty sure the guy still has them,PM me if you want me to check.
2014-True Blue SLT,CC 6.4 BOX.
Air suspension,Rambox,Navigation.Backup camera.