WY itinerary

Okay, starting to plan a trip to Wyoming in late May, early June. 
We'll be going out through Nebraska (wife has 50th HS reunion in
Nebraska City), and have agreed on Devils Tower as a destination.

After a day or two there, I'm thinking to head over to Grand Teton
and spend a day or two there.  On the map, it doesn't seem that
Yellowstone is all that far, but the routing on Google maps all
seems to go around into Idaho and then Montana, coming in from the
north.  Any high level tips on how to approach this?  Neither of
us have been to Yellowstone, so that would be a great destination. 
On the other hand, I'm starting to wonder if it might be biting
off too much on top of the other two destinations. 

We probably can take 2-3 weeks total, and I don't like driving
much over 250 miles in a day with the trailer.

--
Ted Heise      <theise@panix.com>       West Lafayette, IN, USA