I know what you have been going thru Jim. I have bought & sold in different phases & for different reasons too.
I started out with a temporary tow rig. It was a brand new '02 WJ with lots of bells & whistles that I used to tow my YJ basically around the neighborhood. I never actually used it to tow my YJ to the trails.
I then bought my 2wd '03 2500 Ram Quad Cab Hemi. I kept that truck for ~5.5 years and towed cross country with it a number of times.
In the mean time, I also bought a ~30' Class A RV. I towed with the truck sometimes and the RV sometimes.
Being a single guy and no longer taking my kids with me wheelin' - I really didn't need the space the RV had, so I sold it and put a camper on the 2500. Best decision I could had made given I didn't need the space of the RV, extra insurance, registration, smog, a place to park it, cleaning, maintenance, etc.
The 2500 Ram was a good truck overall - but I wanted something more suitable for the long haul. That's when the 3500 CTD was considered and purchased.
Jim, maybe you're looking to go Ford again. I don't know, but since you're in the market, and as a heads-up, there have been some problems with the newer '07+ 6.9L CTD's. Mostly emissions related stuff. Mine is an '07, but I got the 5.9L CTD knowing of the problems. Both engines were available in '07. The '08's all have the 6.7L CTD's.