$1K sounds decent, as least for my area here in Ontario, Canada where everything is overpriced. I'm not due for anything on my 2011 5.7 yet, but while I was in for an oil change I got some prices, all are estimates:
Tune up: $315
4x4 service: $523 (axles + tcase)
Trans service: $122
NUTS eh!
I don't have a cabin filter in my 2011 SXT.
I use Amsoil fluids, and when the time comes I'll save $600 on labour and another $200 on overpriced dealer fluid and parts. What's worse is that dealers are rather competitive in this area with local shops, but I find that dealers won't drop their prices (to match smaller shops) to obtain the business.
As bamablack11 mentioned, the Ram doesn't really drive like a truck. I had a 2000 Durango R/T for 11 years, and a 1990 C1500 before that and both of those vehicles rode similar. The Durango was a bit rough, but that's what I bought it for - to hit the trails on weekends while still being able to tow 3 tons. Maintenance was a breeze, and parts were everywhere.