Look at it this way. Assuming your 2500 has the same wheelbase as the 1500, then dropping the tongue on the ball will add just as much weight to the rear axle, and remove just as much weight from the front axle. Why would you not want to transfer that lost weight back up to the front wheels, for optimum stability, steering, etc.
Your 2500 has a stronger suspension, so you don't see the effects like you did with the "soft" 1500. But leveling out your 1500 was the secondary benefit. Transferring weight was primary, and it still is primary for your 2500.
PS - You said your hitch is rated for 1800lbs, but that's the limit in WD mode. In order to consider eliminating the WDH, you need to know the TW limit in WC mode (weight-carrying).
thebrakeman ('70), DW ('71), DD ('99), DD ('01), DD ('05)
2004 Surveyor SV261T (UltraLite Bunkhouse Hybrid)
2006 Mercury Mountaineer V8 AWD Premier
Equal-i-zer WDH (10k), Prodigy Brake Controller