My 06 has a low washer fluid light... its been driving me nuts too... I ran out of fluid the other day, and now that I have fulled it back up, the light keeps comming on! I think I have figured out the problem though... looking down into engine bay... the washer fluid bottle kinda wraps around under the coolant overflow.... it looks to me like I can see air trapped down there.... right where the float is....

 

My 05 Laramine has everything except a power rear window and fender well inserts (rear) I have u-connect, infinity sound dual power heated seats. steering wheel radio controls, adjustabl pedals. sun roof. aluminum door sill floor cover things that say dodge.