I think the extended control arms are absolutely necessary. Without them, caster is off resulting in wheels that don't naturally return to center and subsequently gives your truck the dreaded death wobble. Search for death wobble articles and you'll see they're usually trucks with 2-3" of spacers without the the extended arms. I bought the extended arms for my RAM and it rides/drives/steers just like OEM, probably a bit better.
2001 QuadCab SLT Plus 2500 4x4 V10 Auto 4.56 SG
K&N FIPK, Fastman TB, Borla Catback, SCT tuner, 1.7 RRs, JBA shorties
Rancho 2" leveling kit RS5000 shocks, Thuren trackbar
20"x9" KMC Backseat wheels w/Goodyear MT/R 285/65/20 (35's)
Dual Batteries, GPS, Bluetooth, heated leather seats