I went through the same thing when I sold the 2006 truck in my signature about 2 months ago. I hated to see it go, but it was the financially responsible thing to do.
It was an awesome truck, my all time favorite in fact, even considering I've owned the 2009 in my sig since it was new.
I drove the snot out of it the two years I had it, putting around 60k miles on it doing part time RV transport around WA, OR and ID in the spring and summer.
Congrats on selling it. Many times that is the toughest part is getting a rig sold.