My 2002 2wd is also showing signs of "toe wear" on the outer edges of the front tires. I bought it with 4K miles on it, so I complained. They put it on the alignment rack. Everything is set to factory specs. "feathering" on the outside of the front tire is caused by Toe wear, but my toe is set to . 1 deg total toe.
I have had a 95 Dekota 4x4, 96 ram 1500 4x4 98 ram 2500 2wd 2002 ram 3500 2wd and everyone of these showed the same tread wear problem on the outer edge of the tire.
The 95 and 96 came with Goodyear AT tires. At the time there was a TSB or letter from dodge to the dealers floating around where Dodge was pointing fingers at Goodyear for making bad tires, but goodyear was saying it was dodge's alignment. To make a long story short the letter allowed me to get Goodyear GS-A's installed for free. the GS-A has a outer tread band that looks like a "highway rib" tires, while the rest of the tread bands are AT style. Plus its a harder compound tire. This fixed the problem on both 4wd's.
Since then, I notice Dodge was putting the GS-A's on some of the 1500's and the Jeep's from the factory. Goodyear also redesigned the AT tire around 1999 or so.
On the 98 I had Goodyear RT-s tires. I got tired of having Goodyear adjusting the Rt-s with little bubbles in the sidewall, so I threw on a set of Cooper SRM-2's (highway rib tires, with a MS rateing, again a harder compound tire) That took care of the tread wear on the 98
the 2002 has Michelin's on it. I only drive the truck around 10K miles per year, so I should not have to worry about buying tires until 2006 if I keep rotating them.
Dodge recomends rotating the tires every oil change. If you do this, the tires should last longer.