My 1997 4x4, 2500 long bed, club cab I think rides super. Firm, but not harsh.
Details:
2" Rancho front lift w Rancho 9000's (9 way front 5 ways on rear)
Poly front sway bar bushings
Firestone Air Lift rear air bags - 30 psi / 100 psi - unloaded / loaded
19. 5 Michelin XDC 22 tires - 110 for towing, 80-90 unloaded
I think that's about it on anything that affects ride. I don't have factory overloads - and the ride is very nice, but I can tow up to 24,000 and the ride is still nice.
Shocks at # 4 front, & # 3 rear (empty) or
# 7 or 8 front, # 5 rear (towing heavy)
19. 5's - contrary to popular mis conception - don't make the ride harsh, they make it firm, but the larger radius ignores the smaller bumps that upset the stock 16" tires, you control firmness by air pressure.
By changing the Rancho shock settings and varying the airbag pressure & tire pressure - you can dial in any characteristics you want or need.
Good luck, David B.