If you are looking at an F-150 or Dodge Ram Offroad, read this...

I have been a service advisor at both Ford and Dodge dealerships. While both companies make great Full Size pickups, I did notice a big difference between the two when it came to servicing requirements. I just figured I would pass it on to the public, so you would know what kind of expense you would face when buying either an F-150 or a Ram pickup.
  First off, the Ram (and Dakota for that matter) have rear differentials that the manufacturer recommends you have serviced every 12,000 miles. I am not making that up. Check the owners manual. I saw many a Ram pickup with Ring and Pinion problems in the rear diff. due to lack of service. The F-150, on the other hand, only requires servicing at about 90,000 miles. So that can save you a big chunk of change in the long haul.
  Secondly, the Hemi engined Ram requires its spark plugs (all sixteen of them...don't ask)to be replaced every 30,000 miles. Again the F-150 goes until 90,000 miles. While I think the Hemi is the better engine performance wise, it does require more maintenance.
 Does this mean I am recommending the Ford? Probably from a long term expense point of view I think it is the better value. But it is hard to argue with the noise from that Hemi. As I have no experience at a Toyota or GM dealer I don't really know the expense involved with maintaining a Tundra or GMC Sierra. But if you are shopping for one of those call the corresponding service department and ask the service advisor what sort of maintenance is required for the vehicle you are interested in. Always good to go into your new truck relationship with your eyes open.  

Along those lines, I know the early Titans had a lot of rear ends go out because you're supposed to only drive up to like 60 or 65 miles per hour for the first several thousand miles. If you take a look underneath the newer Titans, they have finned aluminum differential covers. I guess the heat buildup was a big contributor to those diff failures.

30k is pretty typical for spark-plug changes. But eating the cost for 16 of them instead of 8 could get pretty stiff.

I'd like the Ford more if it weren't for the fact that it's overweight and underpowered, even with the 5.4. Supposedly, those new "Boss" engines are supposed to have a lot more power, but with the new Tundra setting the bar at 381, they'd better up their game considerably.