One quick note on the Ram navigation system, it is not c.d. based, but satellite based, so updates are not an issue. The U Connect, Sirius/XM radio, and nav are top notch. If you're planning on keeping the truck, you might as well get the options you can afford.
I second the opinion about the SRW Ram. The only reason I have the DRW 3500 is the 15,000 fifth wheel I tow. A travel trailer hooked to a proper towing package should at most require a SRW 3500, probably a 2500 would get it done.