If your radiator is good/ cooling system is in relatively good shape dont mess with it right away
Timbrens are half the price of airbags, set and forget. No maintenance. I've used them
Brake controller you will need no matter what
Trans cooler is cheap
WD hitch probably no getting around that. Look for used?
Axle again I wouldn't bother. WD hitch will spread the tongue weight. Unless you swap to full float it's just not worth it IMO
Tires will be a nightmare. No getting around them.
Hell tires and hitch and brake controller and see how it feels. I think you'll be fine